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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">VecDeque</span>};

<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">deserialize_btreemap</span>, <span class="ident">serialize_btreemap</span>, <span class="ident">Counter</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Distance</span>, <span class="ident">Duration</span>, <span class="ident">Speed</span>, <span class="ident">Time</span>};
<span class="kw">use</span> <span class="ident">map_model</span>::{
    <span class="ident">BuildingID</span>, <span class="ident">IntersectionID</span>, <span class="ident">Map</span>, <span class="ident">PathConstraints</span>, <span class="ident">PathRequest</span>, <span class="ident">Position</span>, <span class="ident">TransitRouteID</span>,
    <span class="ident">TransitStopID</span>,
};
<span class="kw">use</span> <span class="ident">synthpop</span>::{
    <span class="ident">IndividTrip</span>, <span class="ident">OrigPersonID</span>, <span class="ident">PersonSpec</span>, <span class="ident">Scenario</span>, <span class="ident">TripEndpoint</span>, <span class="ident">TripMode</span>, <span class="ident">TripPurpose</span>,
};

<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::sim::Ctx</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">AgentID</span>, <span class="ident">AgentType</span>, <span class="ident">AlertLocation</span>, <span class="ident">CarID</span>, <span class="ident">Command</span>, <span class="ident">CreateCar</span>, <span class="ident">CreatePedestrian</span>, <span class="ident">DrivingGoal</span>,
    <span class="ident">Event</span>, <span class="ident">ParkedCar</span>, <span class="ident">ParkingSim</span>, <span class="ident">ParkingSpot</span>, <span class="ident">PedestrianID</span>, <span class="ident">PersonID</span>, <span class="ident">SidewalkPOI</span>, <span class="ident">SidewalkSpot</span>,
    <span class="ident">StartTripArgs</span>, <span class="ident">TransitSimState</span>, <span class="ident">TripID</span>, <span class="ident">TripPhaseType</span>, <span class="ident">TripSpec</span>, <span class="ident">Vehicle</span>, <span class="ident">VehicleSpec</span>,
    <span class="ident">VehicleType</span>, <span class="ident">WalkingSimState</span>,
};

<span class="doccomment">/// Manages people, each of which executes some trips through the day. Each trip is further broken</span>
<span class="doccomment">/// down into legs -- for example, a driving trip might start with somebody walking to their car,</span>
<span class="doccomment">/// driving somewhere, parking, and then walking to their final destination.</span>
<span class="doccomment">/// https://a-b-street.github.io/tech/docs/trafficsim/trips.html describes some of the variations.</span>
<span class="comment">//</span>
<span class="comment">// Here be dragons, keep hands and feet inside the ride at all times...</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="ident">TripManager</span> {
    <span class="ident">trips</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Trip</span><span class="op">&gt;</span>,
    <span class="ident">people</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Person</span><span class="op">&gt;</span>,
    <span class="comment">// For quick lookup of active agents</span>
    <span class="attribute">#[<span class="ident">serde</span>(
        <span class="ident">serialize_with</span> <span class="op">=</span> <span class="string">&quot;serialize_btreemap&quot;</span>,
        <span class="ident">deserialize_with</span> <span class="op">=</span> <span class="string">&quot;deserialize_btreemap&quot;</span>
    )]</span>
    <span class="ident">active_trip_mode</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">AgentID</span>, <span class="ident">TripID</span><span class="op">&gt;</span>,
    <span class="ident">unfinished_trips</span>: <span class="ident">usize</span>,

    <span class="ident">car_id_counter</span>: <span class="ident">usize</span>,

    <span class="ident">events</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Event</span><span class="op">&gt;</span>,
}

<span class="comment">// Initialization</span>
<span class="kw">impl</span> <span class="ident">TripManager</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -&gt; <span class="ident">TripManager</span> {
        <span class="ident">TripManager</span> {
            <span class="ident">trips</span>: <span class="ident">Vec::new</span>(),
            <span class="ident">people</span>: <span class="ident">Vec::new</span>(),
            <span class="ident">active_trip_mode</span>: <span class="ident">BTreeMap::new</span>(),
            <span class="ident">unfinished_trips</span>: <span class="number">0</span>,
            <span class="ident">car_id_counter</span>: <span class="number">0</span>,
            <span class="ident">events</span>: <span class="ident">Vec::new</span>(),
        }
    }

    <span class="comment">// TODO assert the specs are correct yo</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_person</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">orig_id</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">OrigPersonID</span><span class="op">&gt;</span>,
        <span class="ident">ped_speed</span>: <span class="ident">Speed</span>,
        <span class="ident">vehicle_specs</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">VehicleSpec</span><span class="op">&gt;</span>,
    ) -&gt; <span class="kw-2">&amp;</span><span class="ident">Person</span> {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">PersonID</span>(<span class="self">self</span>.<span class="ident">people</span>.<span class="ident">len</span>());
        <span class="kw">let</span> <span class="ident">vehicles</span> <span class="op">=</span> <span class="ident">vehicle_specs</span>
            .<span class="ident">into_iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> {
                <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">CarID</span> {
                    <span class="ident">id</span>: <span class="self">self</span>.<span class="ident">new_car_id</span>(),
                    <span class="ident">vehicle_type</span>: <span class="ident">v</span>.<span class="ident">vehicle_type</span>,
                };
                <span class="ident">v</span>.<span class="ident">make</span>(<span class="ident">c</span>, <span class="prelude-val">Some</span>(<span class="ident">id</span>))
            })
            .<span class="ident">collect</span>();
        <span class="self">self</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">Person</span> {
            <span class="ident">id</span>,
            <span class="ident">orig_id</span>,
            <span class="ident">trips</span>: <span class="ident">Vec::new</span>(),
            <span class="comment">// The first new_trip will set this properly.</span>
            <span class="ident">state</span>: <span class="ident">PersonState::OffMap</span>,
            <span class="ident">ped</span>: <span class="ident">PedestrianID</span>(<span class="ident">id</span>.<span class="number">0</span>),
            <span class="ident">ped_speed</span>,
            <span class="ident">vehicles</span>,
            <span class="ident">delayed_trips</span>: <span class="ident">Vec::new</span>(),
            <span class="ident">on_bus</span>: <span class="prelude-val">None</span>,
        });
        <span class="self">self</span>.<span class="ident">get_person</span>(<span class="ident">id</span>).<span class="ident">unwrap</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_car_id</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="ident">usize</span> {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">car_id_counter</span>;
        <span class="self">self</span>.<span class="ident">car_id_counter</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
        <span class="ident">id</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_trip</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">person</span>: <span class="ident">PersonID</span>, <span class="ident">info</span>: <span class="ident">TripInfo</span>) -&gt; <span class="ident">TripID</span> {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">TripID</span>(<span class="self">self</span>.<span class="ident">trips</span>.<span class="ident">len</span>());
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="ident">Trip</span> {
            <span class="ident">id</span>,
            <span class="ident">info</span>,
            <span class="ident">person</span>,
            <span class="ident">started</span>: <span class="bool-val">false</span>,
            <span class="ident">finished_at</span>: <span class="prelude-val">None</span>,
            <span class="ident">total_blocked_time</span>: <span class="ident">Duration::ZERO</span>,
            <span class="ident">total_distance</span>: <span class="ident">Distance::ZERO</span>,
            <span class="ident">legs</span>: <span class="ident">VecDeque::new</span>(),
        };
        <span class="self">self</span>.<span class="ident">unfinished_trips</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>];
        <span class="kw">if</span> <span class="ident">person</span>.<span class="ident">trips</span>.<span class="ident">is_empty</span>() {
            <span class="ident">person</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">start</span> {
                <span class="ident">TripEndpoint::Building</span>(<span class="ident">b</span>) =&gt; {
                    <span class="self">self</span>.<span class="ident">events</span>
                        .<span class="ident">push</span>(<span class="ident">Event::PersonEntersBuilding</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="ident">b</span>));
                    <span class="ident">PersonState::Inside</span>(<span class="ident">b</span>)
                }
                <span class="ident">TripEndpoint::Border</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">TripEndpoint::SuddenlyAppear</span>(<span class="kw">_</span>) =&gt; <span class="ident">PersonState::OffMap</span>,
            };
        }
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="ident">person</span>.<span class="ident">trips</span>.<span class="ident">last</span>() {
            <span class="comment">// TODO If it&#39;s exactly ==, what?! See the ID.</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">t</span>.<span class="number">0</span>].<span class="ident">info</span>.<span class="ident">departure</span> <span class="op">&gt;</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">departure</span> {
                <span class="macro">panic!</span>(
                    <span class="string">&quot;{} has a trip starting at {}, then one at {}&quot;</span>,
                    <span class="ident">person</span>.<span class="ident">id</span>, <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">t</span>.<span class="number">0</span>].<span class="ident">info</span>.<span class="ident">departure</span>, <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">departure</span>
                );
            }
        }
        <span class="ident">person</span>.<span class="ident">trips</span>.<span class="ident">push</span>(<span class="ident">id</span>);
        <span class="self">self</span>.<span class="ident">trips</span>.<span class="ident">push</span>(<span class="ident">trip</span>);
        <span class="ident">id</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">start_trip</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">now</span>: <span class="ident">Time</span>, <span class="ident">trip</span>: <span class="ident">TripID</span>, <span class="ident">args</span>: <span class="ident">StartTripArgs</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>) {
        <span class="macro">assert!</span>(<span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">info</span>.<span class="ident">cancellation_reason</span>.<span class="ident">is_none</span>());

        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">people</span>[<span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">person</span>.<span class="number">0</span>];
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">PersonState::Trip</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">person</span>.<span class="ident">state</span> {
            <span class="comment">// Previous trip isn&#39;t done. Defer this one!</span>
            <span class="kw">if</span> <span class="bool-val">false</span> {
                <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::Alert</span>(
                    <span class="ident">AlertLocation::Person</span>(<span class="ident">person</span>.<span class="ident">id</span>),
                    <span class="macro">format!</span>(
                        <span class="string">&quot;{} is still doing a trip, so not starting {} yet&quot;</span>,
                        <span class="ident">person</span>.<span class="ident">id</span>, <span class="ident">trip</span>
                    ),
                ));
            }
            <span class="ident">person</span>.<span class="ident">delayed_trips</span>.<span class="ident">push</span>((<span class="ident">trip</span>, <span class="ident">args</span>));
            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::TripPhaseStarting</span>(
                <span class="ident">trip</span>,
                <span class="ident">person</span>.<span class="ident">id</span>,
                <span class="prelude-val">None</span>,
                <span class="ident">TripPhaseType::DelayedStart</span>,
            ));
            <span class="kw">return</span>;
        }
        <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">started</span> <span class="op">=</span> <span class="bool-val">true</span>;

        <span class="kw">let</span> <span class="ident">info</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">info</span>;
        <span class="kw">let</span> <span class="ident">spec</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">TripSpec::maybe_new</span>(
            <span class="ident">info</span>.<span class="ident">start</span>,
            <span class="ident">info</span>.<span class="ident">end</span>,
            <span class="ident">info</span>.<span class="ident">mode</span>,
            <span class="ident">args</span>.<span class="ident">use_vehicle</span>,
            <span class="ident">args</span>.<span class="ident">retry_if_no_room</span>,
            <span class="ident">ctx</span>.<span class="ident">map</span>,
        ) {
            <span class="prelude-val">Ok</span>(<span class="ident">spec</span>) =&gt; <span class="ident">spec</span>,
            <span class="prelude-val">Err</span>(<span class="ident">error</span>) =&gt; <span class="ident">TripSpec::SpawningFailure</span> {
                <span class="ident">use_vehicle</span>: <span class="ident">args</span>.<span class="ident">use_vehicle</span>,
                <span class="ident">error</span>: <span class="ident">error</span>.<span class="ident">to_string</span>(),
            },
        };
        <span class="comment">// to_plan might actually change the TripSpec</span>
        <span class="kw">let</span> (<span class="ident">spec</span>, <span class="ident">legs</span>) <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">into_plan</span>(<span class="ident">ctx</span>.<span class="ident">map</span>);
        <span class="macro">assert!</span>(<span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">legs</span>.<span class="ident">is_empty</span>());
        <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">legs</span>.<span class="ident">extend</span>(<span class="ident">legs</span>);

        <span class="kw">match</span> <span class="ident">spec</span> {
            <span class="ident">TripSpec::VehicleAppearing</span> {
                <span class="ident">start_pos</span>,
                <span class="ident">goal</span>,
                <span class="ident">retry_if_no_room</span>,
                <span class="ident">use_vehicle</span>,
            } =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">person</span>.<span class="ident">state</span>, <span class="ident">PersonState::OffMap</span>);
                <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonEntersMap</span>(
                    <span class="ident">person</span>.<span class="ident">id</span>,
                    <span class="ident">AgentID::Car</span>(<span class="ident">use_vehicle</span>),
                    <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">start_pos</span>.<span class="ident">lane</span>()).<span class="ident">src_i</span>,
                ));
                <span class="ident">person</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Trip</span>(<span class="ident">trip</span>);

                <span class="kw">let</span> <span class="ident">vehicle</span> <span class="op">=</span> <span class="ident">person</span>.<span class="ident">get_vehicle</span>(<span class="ident">use_vehicle</span>);
                <span class="macro">assert!</span>(<span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">lookup_parked_car</span>(<span class="ident">vehicle</span>.<span class="ident">id</span>).<span class="ident">is_none</span>());
                <span class="kw">let</span> <span class="ident">constraints</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">use_vehicle</span>.<span class="ident">vehicle_type</span> <span class="op">==</span> <span class="ident">VehicleType::Bike</span> {
                    <span class="ident">PathConstraints::Bike</span>
                } <span class="kw">else</span> {
                    <span class="ident">PathConstraints::Car</span>
                };
                <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::vehicle</span>(
                    <span class="ident">start_pos</span>,
                    <span class="ident">goal</span>.<span class="ident">goal_pos</span>(<span class="ident">constraints</span>, <span class="ident">ctx</span>.<span class="ident">map</span>).<span class="ident">unwrap</span>(),
                    <span class="ident">constraints</span>,
                );
                <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="ident">person</span>.<span class="ident">id</span>;

                <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                        <span class="kw">let</span> <span class="ident">router</span> <span class="op">=</span> <span class="ident">goal</span>.<span class="ident">make_router</span>(<span class="ident">vehicle</span>.<span class="ident">id</span>, <span class="ident">path</span>, <span class="ident">ctx</span>.<span class="ident">map</span>);
                        <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                            <span class="ident">now</span>,
                            <span class="ident">Command::SpawnCar</span>(
                                <span class="ident">CreateCar::for_appearing</span>(<span class="ident">vehicle</span>, <span class="ident">router</span>, <span class="ident">trip</span>, <span class="ident">person</span>),
                                <span class="ident">retry_if_no_room</span>,
                            ),
                        );
                    }
                    <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                        <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">Some</span>(<span class="ident">vehicle</span>), <span class="ident">ctx</span>);
                    }
                }
            }
            <span class="ident">TripSpec::SpawningFailure</span> {
                <span class="ident">use_vehicle</span>, <span class="ident">error</span>, ..
            } =&gt; {
                <span class="kw">let</span> <span class="ident">vehicle</span> <span class="op">=</span> <span class="ident">use_vehicle</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">person</span>.<span class="ident">get_vehicle</span>(<span class="ident">v</span>));
                <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">error</span>, <span class="ident">vehicle</span>, <span class="ident">ctx</span>);
            }
            <span class="ident">TripSpec::UsingParkedCar</span> {
                <span class="ident">car</span>, <span class="ident">start_bldg</span>, ..
            } =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">person</span>.<span class="ident">state</span>, <span class="ident">PersonState::Inside</span>(<span class="ident">start_bldg</span>));
                <span class="ident">person</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Trip</span>(<span class="ident">trip</span>);

                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">parked_car</span>) <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">lookup_parked_car</span>(<span class="ident">car</span>).<span class="ident">cloned</span>() {
                    <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">SidewalkSpot::building</span>(<span class="ident">start_bldg</span>, <span class="ident">ctx</span>.<span class="ident">map</span>);
                    <span class="kw">let</span> <span class="ident">walking_goal</span> <span class="op">=</span>
                        <span class="ident">SidewalkSpot::parking_spot</span>(<span class="ident">parked_car</span>.<span class="ident">spot</span>, <span class="ident">ctx</span>.<span class="ident">map</span>, <span class="ident">ctx</span>.<span class="ident">parking</span>);
                    <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::walking</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>, <span class="ident">walking_goal</span>.<span class="ident">sidewalk_pos</span>);
                    <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
                        <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                            <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                                <span class="ident">now</span>,
                                <span class="ident">Command::SpawnPed</span>(<span class="ident">CreatePedestrian</span> {
                                    <span class="ident">id</span>: <span class="ident">person</span>.<span class="ident">ped</span>,
                                    <span class="ident">speed</span>: <span class="ident">person</span>.<span class="ident">ped_speed</span>,
                                    <span class="ident">start</span>,
                                    <span class="ident">goal</span>: <span class="ident">walking_goal</span>,
                                    <span class="ident">path</span>,
                                    <span class="ident">trip</span>,
                                    <span class="ident">person</span>: <span class="ident">person</span>.<span class="ident">id</span>,
                                }),
                            );
                        }
                        <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                            <span class="comment">// Move the car to the destination</span>
                            <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">remove_parked_car</span>(<span class="ident">parked_car</span>.<span class="ident">clone</span>());
                            <span class="self">self</span>.<span class="ident">cancel_trip</span>(
                                <span class="ident">now</span>,
                                <span class="ident">trip</span>,
                                <span class="ident">err</span>.<span class="ident">to_string</span>(),
                                <span class="prelude-val">Some</span>(<span class="ident">parked_car</span>.<span class="ident">vehicle</span>),
                                <span class="ident">ctx</span>,
                            );
                        }
                    }
                } <span class="kw">else</span> {
                    <span class="comment">// This should only happen when a driving trip has been cancelled and there was</span>
                    <span class="comment">// absolutely no room to warp the car.</span>
                    <span class="self">self</span>.<span class="ident">cancel_trip</span>(
                        <span class="ident">now</span>,
                        <span class="ident">trip</span>,
                        <span class="macro">format!</span>(<span class="string">&quot;should have {} parked somewhere, but it&#39;s unavailable&quot;</span>, <span class="ident">car</span>),
                        <span class="prelude-val">None</span>,
                        <span class="ident">ctx</span>,
                    );
                }
            }
            <span class="ident">TripSpec::JustWalking</span> { <span class="ident">start</span>, <span class="ident">goal</span> } =&gt; {
                <span class="macro">assert_eq!</span>(
                    <span class="ident">person</span>.<span class="ident">state</span>,
                    <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">connection</span> {
                        <span class="ident">SidewalkPOI::Building</span>(<span class="ident">b</span>) =&gt; <span class="ident">PersonState::Inside</span>(<span class="ident">b</span>),
                        <span class="ident">SidewalkPOI::Border</span>(<span class="ident">i</span>) =&gt; {
                            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonEntersMap</span>(
                                <span class="ident">person</span>.<span class="ident">id</span>,
                                <span class="ident">AgentID::Pedestrian</span>(<span class="ident">person</span>.<span class="ident">ped</span>),
                                <span class="ident">i</span>,
                            ));
                            <span class="ident">PersonState::OffMap</span>
                        }
                        <span class="ident">SidewalkPOI::SuddenlyAppear</span> =&gt; {
                            <span class="comment">// Unclear which end of the sidewalk this person should be associated</span>
                            <span class="comment">// with. For interactively spawned people, doesn&#39;t really matter.</span>
                            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonEntersMap</span>(
                                <span class="ident">person</span>.<span class="ident">id</span>,
                                <span class="ident">AgentID::Pedestrian</span>(<span class="ident">person</span>.<span class="ident">ped</span>),
                                <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>.<span class="ident">lane</span>()).<span class="ident">src_i</span>,
                            ));
                            <span class="ident">PersonState::OffMap</span>
                        }
                        <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
                    }
                );
                <span class="ident">person</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Trip</span>(<span class="ident">trip</span>);

                <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::walking</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>, <span class="ident">goal</span>.<span class="ident">sidewalk_pos</span>);
                <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                        <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                            <span class="ident">now</span>,
                            <span class="ident">Command::SpawnPed</span>(<span class="ident">CreatePedestrian</span> {
                                <span class="ident">id</span>: <span class="ident">person</span>.<span class="ident">ped</span>,
                                <span class="ident">speed</span>: <span class="ident">person</span>.<span class="ident">ped_speed</span>,
                                <span class="ident">start</span>,
                                <span class="ident">goal</span>,
                                <span class="ident">path</span>,
                                <span class="ident">trip</span>,
                                <span class="ident">person</span>: <span class="ident">person</span>.<span class="ident">id</span>,
                            }),
                        );
                    }
                    <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                        <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">None</span>, <span class="ident">ctx</span>);
                    }
                }
            }
            <span class="ident">TripSpec::UsingBike</span> { <span class="ident">start</span>, .. } =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">person</span>.<span class="ident">state</span>, <span class="ident">PersonState::Inside</span>(<span class="ident">start</span>));
                <span class="ident">person</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Trip</span>(<span class="ident">trip</span>);

                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">walk_to</span>) <span class="op">=</span> <span class="ident">SidewalkSpot::bike_rack</span>(<span class="ident">start</span>, <span class="ident">ctx</span>.<span class="ident">map</span>) {
                    <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::walking</span>(
                        <span class="ident">SidewalkSpot::building</span>(<span class="ident">start</span>, <span class="ident">ctx</span>.<span class="ident">map</span>).<span class="ident">sidewalk_pos</span>,
                        <span class="ident">walk_to</span>.<span class="ident">sidewalk_pos</span>,
                    );
                    <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
                        <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                            <span class="comment">// Where we start biking may have slightly changed due to live map</span>
                            <span class="comment">// edits!</span>
                            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">trip</span>.<span class="number">0</span>].<span class="ident">legs</span>.<span class="ident">front_mut</span>() {
                                <span class="prelude-val">Some</span>(<span class="ident">TripLeg::Walk</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">spot</span>)) =&gt; {
                                    <span class="kw">if</span> <span class="ident">spot</span>.<span class="ident">clone</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">walk_to</span> {
                                        <span class="comment">// We could assert both have a BikeRack connection, but eh</span>
                                        <span class="kw-2">*</span><span class="ident">spot</span> <span class="op">=</span> <span class="ident">walk_to</span>.<span class="ident">clone</span>();
                                    }
                                }
                                <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
                            }

                            <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                                <span class="ident">now</span>,
                                <span class="ident">Command::SpawnPed</span>(<span class="ident">CreatePedestrian</span> {
                                    <span class="ident">id</span>: <span class="ident">person</span>.<span class="ident">ped</span>,
                                    <span class="ident">speed</span>: <span class="ident">person</span>.<span class="ident">ped_speed</span>,
                                    <span class="ident">start</span>: <span class="ident">SidewalkSpot::building</span>(<span class="ident">start</span>, <span class="ident">ctx</span>.<span class="ident">map</span>),
                                    <span class="ident">goal</span>: <span class="ident">walk_to</span>,
                                    <span class="ident">path</span>,
                                    <span class="ident">trip</span>,
                                    <span class="ident">person</span>: <span class="ident">person</span>.<span class="ident">id</span>,
                                }),
                            );
                        }
                        <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                            <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">None</span>, <span class="ident">ctx</span>);
                        }
                    }
                } <span class="kw">else</span> {
                    <span class="self">self</span>.<span class="ident">cancel_trip</span>(
                        <span class="ident">now</span>,
                        <span class="ident">trip</span>,
                        <span class="macro">format!</span>(
                            <span class="string">&quot;UsingBike trip couldn&#39;t find a way to start biking from {}&quot;</span>,
                            <span class="ident">start</span>
                        ),
                        <span class="prelude-val">None</span>,
                        <span class="ident">ctx</span>,
                    );
                }
            }
            <span class="ident">TripSpec::UsingTransit</span> { <span class="ident">start</span>, <span class="ident">stop1</span>, .. } =&gt; {
                <span class="macro">assert_eq!</span>(
                    <span class="ident">person</span>.<span class="ident">state</span>,
                    <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">connection</span> {
                        <span class="ident">SidewalkPOI::Building</span>(<span class="ident">b</span>) =&gt; <span class="ident">PersonState::Inside</span>(<span class="ident">b</span>),
                        <span class="ident">SidewalkPOI::Border</span>(<span class="ident">i</span>) =&gt; {
                            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonEntersMap</span>(
                                <span class="ident">person</span>.<span class="ident">id</span>,
                                <span class="ident">AgentID::Pedestrian</span>(<span class="ident">person</span>.<span class="ident">ped</span>),
                                <span class="ident">i</span>,
                            ));
                            <span class="ident">PersonState::OffMap</span>
                        }
                        <span class="ident">SidewalkPOI::SuddenlyAppear</span> =&gt; {
                            <span class="comment">// Unclear which end of the sidewalk this person should be associated</span>
                            <span class="comment">// with. For interactively spawned people, doesn&#39;t really matter.</span>
                            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonEntersMap</span>(
                                <span class="ident">person</span>.<span class="ident">id</span>,
                                <span class="ident">AgentID::Pedestrian</span>(<span class="ident">person</span>.<span class="ident">ped</span>),
                                <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">get_l</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>.<span class="ident">lane</span>()).<span class="ident">src_i</span>,
                            ));
                            <span class="ident">PersonState::OffMap</span>
                        }
                        <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
                    }
                );
                <span class="ident">person</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Trip</span>(<span class="ident">trip</span>);

                <span class="kw">let</span> <span class="ident">walk_to</span> <span class="op">=</span> <span class="ident">SidewalkSpot::bus_stop</span>(<span class="ident">stop1</span>, <span class="ident">ctx</span>.<span class="ident">map</span>);
                <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::walking</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>, <span class="ident">walk_to</span>.<span class="ident">sidewalk_pos</span>);
                <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                        <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                            <span class="ident">now</span>,
                            <span class="ident">Command::SpawnPed</span>(<span class="ident">CreatePedestrian</span> {
                                <span class="ident">id</span>: <span class="ident">person</span>.<span class="ident">ped</span>,
                                <span class="ident">speed</span>: <span class="ident">person</span>.<span class="ident">ped_speed</span>,
                                <span class="ident">start</span>,
                                <span class="ident">goal</span>: <span class="ident">walk_to</span>,
                                <span class="ident">path</span>,
                                <span class="ident">trip</span>,
                                <span class="ident">person</span>: <span class="ident">person</span>.<span class="ident">id</span>,
                            }),
                        );
                    }
                    <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                        <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">None</span>, <span class="ident">ctx</span>);
                    }
                }
            }
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">collect_events</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>) -&gt; <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Event</span><span class="op">&gt;</span> {
        <span class="ident">std::mem::take</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">events</span>)
    }
}

<span class="comment">// Transitions between different legs of a trip</span>
<span class="kw">impl</span> <span class="ident">TripManager</span> {
    <span class="doccomment">/// This is idempotent to handle the case of cars retrying their spawning.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">agent_starting_trip_leg</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">agent</span>: <span class="ident">AgentID</span>, <span class="ident">t</span>: <span class="ident">TripID</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">other</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">agent</span>) {
            <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="op">!</span><span class="op">=</span> <span class="ident">t</span> {
                <span class="macro">panic!</span>(<span class="string">&quot;{} is doing both {} and {}?&quot;</span>, <span class="ident">agent</span>, <span class="ident">t</span>, <span class="ident">other</span>);
            }
        }
        <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">insert</span>(<span class="ident">agent</span>, <span class="ident">t</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">car_reached_parking_spot</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">car</span>: <span class="ident">CarID</span>,
        <span class="ident">spot</span>: <span class="ident">ParkingSpot</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Car</span>(<span class="ident">car</span>)).<span class="ident">unwrap</span>().<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">TripLeg::Drive</span>(<span class="ident">c</span>, <span class="ident">DrivingGoal::ParkNear</span>(<span class="kw">_</span>))) =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">car</span>, <span class="ident">c</span>);
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="kw">match</span> <span class="kw-2">&amp;</span><span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
            <span class="ident">TripLeg::Walk</span>(<span class="ident">to</span>) =&gt; <span class="kw">match</span> (<span class="ident">spot</span>, <span class="kw-2">&amp;</span><span class="ident">to</span>.<span class="ident">connection</span>) {
                (<span class="ident">ParkingSpot::Offstreet</span>(<span class="ident">b1</span>, <span class="kw">_</span>), <span class="ident">SidewalkPOI::Building</span>(<span class="ident">b2</span>)) <span class="kw">if</span> <span class="ident">b1</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">b2</span> =&gt; {
                    <span class="macro">assert_eq!</span>(<span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">len</span>(), <span class="number">1</span>);
                    <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>().<span class="ident">unwrap</span>();

                    <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Inside</span>(<span class="ident">b1</span>);
                    <span class="self">self</span>.<span class="ident">events</span>
                        .<span class="ident">push</span>(<span class="ident">Event::PersonEntersBuilding</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="ident">b1</span>));
                    <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
                    <span class="self">self</span>.<span class="ident">trip_finished</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">ctx</span>);
                    <span class="kw">return</span>;
                }
                <span class="kw">_</span> =&gt; {}
            },
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">spawn_ped</span>(
            <span class="ident">now</span>,
            <span class="ident">id</span>,
            <span class="ident">SidewalkSpot::parking_spot</span>(<span class="ident">spot</span>, <span class="ident">ctx</span>.<span class="ident">map</span>, <span class="ident">ctx</span>.<span class="ident">parking</span>),
            <span class="ident">ctx</span>,
        );
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ped_reached_parking_spot</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
        <span class="ident">spot</span>: <span class="ident">ParkingSpot</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PedReachedParkingSpot</span>(<span class="ident">ped</span>, <span class="ident">spot</span>));
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>
            .<span class="ident">active_trip_mode</span>
            .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>))
            .<span class="ident">unwrap</span>()
            .<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="ident">trip</span>.<span class="ident">assert_walking_leg</span>(<span class="ident">SidewalkSpot::deferred_parking_spot</span>());
        <span class="kw">let</span> <span class="ident">parked_car</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">get_car_at_spot</span>(<span class="ident">spot</span>).<span class="ident">unwrap</span>().<span class="ident">clone</span>();
        <span class="kw">let</span> <span class="ident">drive_to</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
            <span class="ident">TripLeg::Drive</span>(<span class="ident">c</span>, <span class="kw-2">ref</span> <span class="ident">to</span>) =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">c</span>, <span class="ident">parked_car</span>.<span class="ident">vehicle</span>.<span class="ident">id</span>);
                <span class="ident">to</span>.<span class="ident">clone</span>()
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="kw">let</span> <span class="ident">base_start</span> <span class="op">=</span>
            <span class="ident">ctx</span>.<span class="ident">parking</span>
                .<span class="ident">spot_to_driving_pos</span>(<span class="ident">parked_car</span>.<span class="ident">spot</span>, <span class="kw-2">&amp;</span><span class="ident">parked_car</span>.<span class="ident">vehicle</span>, <span class="ident">ctx</span>.<span class="ident">map</span>);
        <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">drive_to</span>.<span class="ident">goal_pos</span>(<span class="ident">PathConstraints::Car</span>, <span class="ident">ctx</span>.<span class="ident">map</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">spot</span> {
            <span class="ident">ParkingSpot::Onstreet</span>(<span class="kw">_</span>, <span class="kw">_</span>) =&gt; {
                <span class="ident">PathRequest::vehicle</span>(<span class="ident">base_start</span>, <span class="ident">end</span>, <span class="ident">PathConstraints::Car</span>)
            }
            <span class="ident">ParkingSpot::Offstreet</span>(<span class="ident">b</span>, <span class="kw">_</span>) =&gt; {
                <span class="self">self</span>.<span class="ident">events</span>
                    .<span class="ident">push</span>(<span class="ident">Event::PersonEntersBuilding</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="ident">b</span>));
                <span class="ident">PathRequest::leave_from_driveway</span>(<span class="ident">base_start</span>, <span class="ident">end</span>, <span class="ident">PathConstraints::Car</span>, <span class="ident">ctx</span>.<span class="ident">map</span>)
            }
            <span class="ident">ParkingSpot::Lot</span>(<span class="kw">_</span>, <span class="kw">_</span>) =&gt; {
                <span class="ident">PathRequest::leave_from_driveway</span>(<span class="ident">base_start</span>, <span class="ident">end</span>, <span class="ident">PathConstraints::Car</span>, <span class="ident">ctx</span>.<span class="ident">map</span>)
            }
        };

        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">person</span>;
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
            <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                <span class="kw">let</span> <span class="ident">router</span> <span class="op">=</span> <span class="ident">drive_to</span>.<span class="ident">make_router</span>(<span class="ident">parked_car</span>.<span class="ident">vehicle</span>.<span class="ident">id</span>, <span class="ident">path</span>, <span class="ident">ctx</span>.<span class="ident">map</span>);
                <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                    <span class="ident">now</span>,
                    <span class="ident">Command::SpawnCar</span>(
                        <span class="ident">CreateCar::for_parked_car</span>(<span class="ident">parked_car</span>, <span class="ident">router</span>, <span class="ident">trip</span>, <span class="ident">person</span>),
                        <span class="bool-val">true</span>,
                    ),
                );
            }
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                <span class="comment">// Move the car to the destination...</span>
                <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">remove_parked_car</span>(<span class="ident">parked_car</span>.<span class="ident">clone</span>());
                <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">Some</span>(<span class="ident">parked_car</span>.<span class="ident">vehicle</span>), <span class="ident">ctx</span>);
            }
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ped_ready_to_bike</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
        <span class="ident">spot</span>: <span class="ident">SidewalkSpot</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>
            .<span class="ident">active_trip_mode</span>
            .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>))
            .<span class="ident">unwrap</span>()
            .<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="ident">trip</span>.<span class="ident">assert_walking_leg</span>(<span class="ident">spot</span>.<span class="ident">clone</span>());
        <span class="kw">let</span> (<span class="ident">bike</span>, <span class="ident">drive_to</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
            <span class="ident">TripLeg::Drive</span>(<span class="ident">bike</span>, <span class="kw-2">ref</span> <span class="ident">to</span>) =&gt; (<span class="ident">bike</span>, <span class="ident">to</span>.<span class="ident">clone</span>()),
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };
        <span class="kw">let</span> <span class="ident">driving_pos</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">spot</span>.<span class="ident">connection</span> {
            <span class="ident">SidewalkPOI::BikeRack</span>(<span class="ident">p</span>) =&gt; <span class="ident">p</span>,
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">end</span>) <span class="op">=</span> <span class="ident">drive_to</span>.<span class="ident">goal_pos</span>(<span class="ident">PathConstraints::Bike</span>, <span class="ident">ctx</span>.<span class="ident">map</span>) {
            <span class="ident">end</span>
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
            <span class="self">self</span>.<span class="ident">cancel_trip</span>(
                <span class="ident">now</span>,
                <span class="ident">trip</span>,
                <span class="macro">format!</span>(<span class="string">&quot;no bike connection at {:?}&quot;</span>, <span class="ident">drive_to</span>),
                <span class="prelude-val">None</span>,
                <span class="ident">ctx</span>,
            );
            <span class="kw">return</span>;
        };
        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::vehicle</span>(<span class="ident">driving_pos</span>, <span class="ident">end</span>, <span class="ident">PathConstraints::Bike</span>);
        <span class="kw">let</span> <span class="ident">maybe_router</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">req</span>.<span class="ident">start</span>.<span class="ident">lane</span>() <span class="op">==</span> <span class="ident">req</span>.<span class="ident">end</span>.<span class="ident">lane</span>() {
            <span class="comment">// TODO Convert to a walking trip! Ideally, do this earlier and convert the trip to</span>
            <span class="comment">// walking, like schedule_trip does</span>
            <span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(
                <span class="string">&quot;biking to a different part of {} is silly, why not walk?&quot;</span>,
                <span class="ident">req</span>.<span class="ident">start</span>.<span class="ident">lane</span>()
            ))
        } <span class="kw">else</span> {
            <span class="ident">ctx</span>.<span class="ident">map</span>
                .<span class="ident">pathfind</span>(<span class="ident">req</span>)
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">path</span><span class="op">|</span> <span class="ident">drive_to</span>.<span class="ident">make_router</span>(<span class="ident">bike</span>, <span class="ident">path</span>, <span class="ident">ctx</span>.<span class="ident">map</span>))
        };
        <span class="kw">match</span> <span class="ident">maybe_router</span> {
            <span class="prelude-val">Ok</span>(<span class="ident">router</span>) =&gt; {
                <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                    <span class="ident">now</span>,
                    <span class="ident">Command::SpawnCar</span>(
                        <span class="ident">CreateCar::for_appearing</span>(
                            <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">get_vehicle</span>(<span class="ident">bike</span>),
                            <span class="ident">router</span>,
                            <span class="ident">trip</span>.<span class="ident">id</span>,
                            <span class="ident">trip</span>.<span class="ident">person</span>,
                        ),
                        <span class="bool-val">true</span>,
                    ),
                );
            }
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
                <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">None</span>, <span class="ident">ctx</span>);
            }
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bike_reached_end</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">bike</span>: <span class="ident">CarID</span>,
        <span class="ident">bike_rack</span>: <span class="ident">SidewalkSpot</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::BikeStoppedAtSidewalk</span>(
            <span class="ident">bike</span>,
            <span class="ident">bike_rack</span>.<span class="ident">sidewalk_pos</span>.<span class="ident">lane</span>(),
        ));
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Car</span>(<span class="ident">bike</span>)).<span class="ident">unwrap</span>().<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">TripLeg::Drive</span>(<span class="ident">c</span>, <span class="ident">DrivingGoal::ParkNear</span>(<span class="kw">_</span>))) =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">c</span>, <span class="ident">bike</span>);
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">spawn_ped</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">bike_rack</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ped_reached_building</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
        <span class="ident">bldg</span>: <span class="ident">BuildingID</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>
            .<span class="ident">active_trip_mode</span>
            .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>))
            .<span class="ident">unwrap</span>()
            .<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="ident">trip</span>.<span class="ident">assert_walking_leg</span>(<span class="ident">SidewalkSpot::building</span>(<span class="ident">bldg</span>, <span class="ident">ctx</span>.<span class="ident">map</span>));

        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::Inside</span>(<span class="ident">bldg</span>);
        <span class="self">self</span>.<span class="ident">events</span>
            .<span class="ident">push</span>(<span class="ident">Event::PersonEntersBuilding</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="ident">bldg</span>));

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">trip_finished</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">ctx</span>);
    }

    <span class="doccomment">/// If no route is returned, the pedestrian boarded a bus immediately.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ped_reached_bus_stop</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
        <span class="ident">stop</span>: <span class="ident">TransitStopID</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
        <span class="ident">transit</span>: <span class="kw-2">&amp;mut</span> <span class="ident">TransitSimState</span>,
    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">TransitRouteID</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>.<span class="ident">active_trip_mode</span>[<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>)].<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
            <span class="ident">TripLeg::Walk</span>(<span class="kw-2">ref</span> <span class="ident">spot</span>) =&gt; {
                <span class="macro">assert_eq!</span>(<span class="kw-2">*</span><span class="ident">spot</span>, <span class="ident">SidewalkSpot::bus_stop</span>(<span class="ident">stop</span>, <span class="ident">ctx</span>.<span class="ident">map</span>));
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        }
        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">1</span>] {
            <span class="ident">TripLeg::RideBus</span>(<span class="ident">route</span>, <span class="ident">maybe_stop2</span>) =&gt; {
                <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::TripPhaseStarting</span>(
                    <span class="ident">trip</span>.<span class="ident">id</span>,
                    <span class="ident">trip</span>.<span class="ident">person</span>,
                    <span class="prelude-val">None</span>,
                    <span class="ident">TripPhaseType::WaitingForBus</span>(<span class="ident">route</span>, <span class="ident">stop</span>),
                ));
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">bus</span>) <span class="op">=</span> <span class="ident">transit</span>.<span class="ident">ped_waiting_for_bus</span>(
                    <span class="ident">now</span>,
                    <span class="ident">ped</span>,
                    <span class="ident">trip</span>.<span class="ident">id</span>,
                    <span class="ident">trip</span>.<span class="ident">person</span>,
                    <span class="ident">stop</span>,
                    <span class="ident">route</span>,
                    <span class="ident">maybe_stop2</span>,
                    <span class="ident">ctx</span>.<span class="ident">map</span>,
                ) {
                    <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>();
                    <span class="self">self</span>.<span class="ident">active_trip_mode</span>
                        .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>))
                        .<span class="ident">unwrap</span>();
                    <span class="self">self</span>.<span class="ident">active_trip_mode</span>
                        .<span class="ident">insert</span>(<span class="ident">AgentID::BusPassenger</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="ident">bus</span>), <span class="ident">trip</span>.<span class="ident">id</span>);
                    <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">on_bus</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">bus</span>);
                    <span class="prelude-val">None</span>
                } <span class="kw">else</span> {
                    <span class="prelude-val">Some</span>(<span class="ident">route</span>)
                }
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ped_boarded_bus</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
        <span class="ident">bus</span>: <span class="ident">CarID</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">walking</span>: <span class="kw-2">&amp;mut</span> <span class="ident">WalkingSimState</span>,
    ) -&gt; (<span class="ident">TripID</span>, <span class="ident">PersonID</span>) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>
            .<span class="ident">active_trip_mode</span>
            .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>))
            .<span class="ident">unwrap</span>()
            .<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="comment">// No distance crossed between waiting for a bus and boarding</span>

        <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>();
        <span class="ident">walking</span>.<span class="ident">ped_boarded_bus</span>(<span class="ident">now</span>, <span class="ident">ped</span>);
        <span class="self">self</span>.<span class="ident">active_trip_mode</span>
            .<span class="ident">insert</span>(<span class="ident">AgentID::BusPassenger</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="ident">bus</span>), <span class="ident">trip</span>.<span class="ident">id</span>);
        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">on_bus</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">bus</span>);
        (<span class="ident">trip</span>.<span class="ident">id</span>, <span class="ident">trip</span>.<span class="ident">person</span>)
    }

    <span class="comment">// TODO Need to characterize delay the bus experienced</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">person_left_bus</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">now</span>: <span class="ident">Time</span>, <span class="ident">person</span>: <span class="ident">PersonID</span>, <span class="ident">bus</span>: <span class="ident">CarID</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>
            .<span class="ident">active_trip_mode</span>
            .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::BusPassenger</span>(<span class="ident">person</span>, <span class="ident">bus</span>))
            .<span class="ident">unwrap</span>()
            .<span class="number">0</span>];
        <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>().<span class="ident">unwrap</span>() {
            <span class="ident">TripLeg::RideBus</span>(<span class="kw">_</span>, <span class="ident">maybe_stop2</span>) =&gt; <span class="ident">SidewalkSpot::bus_stop</span>(
                <span class="ident">maybe_stop2</span>.<span class="ident">expect</span>(<span class="string">&quot;someone left a bus, even though they should&#39;ve ridden off-map&quot;</span>),
                <span class="ident">ctx</span>.<span class="ident">map</span>,
            ),
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };
        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">on_bus</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">spawn_ped</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">start</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ped_reached_border</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
        <span class="ident">i</span>: <span class="ident">IntersectionID</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>
            .<span class="ident">active_trip_mode</span>
            .<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>))
            .<span class="ident">unwrap</span>()
            .<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">TripLeg::Walk</span>(<span class="ident">spot</span>)) =&gt; <span class="kw">match</span> <span class="ident">spot</span>.<span class="ident">connection</span> {
                <span class="ident">SidewalkPOI::Border</span>(<span class="ident">i2</span>) =&gt; <span class="macro">assert_eq!</span>(<span class="ident">i</span>, <span class="ident">i2</span>),
                <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
            },
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        }

        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripEndpoint::Border</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">end</span> {
            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonLeavesMap</span>(
                <span class="ident">trip</span>.<span class="ident">person</span>,
                <span class="prelude-val">Some</span>(<span class="ident">AgentID::Pedestrian</span>(<span class="ident">ped</span>)),
                <span class="ident">i</span>,
            ));
        }
        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::OffMap</span>;

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">trip_finished</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">transit_rider_reached_border</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">person</span>: <span class="ident">PersonID</span>,
        <span class="ident">bus</span>: <span class="ident">CarID</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">agent</span> <span class="op">=</span> <span class="ident">AgentID::BusPassenger</span>(<span class="ident">person</span>, <span class="ident">bus</span>);
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">agent</span>).<span class="ident">unwrap</span>().<span class="number">0</span>];

        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">TripLeg::RideBus</span>(<span class="kw">_</span>, <span class="ident">maybe_spot2</span>)) =&gt; <span class="macro">assert!</span>(<span class="ident">maybe_spot2</span>.<span class="ident">is_none</span>()),
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        }

        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripEndpoint::Border</span>(<span class="ident">i</span>) <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">end</span> {
            <span class="self">self</span>.<span class="ident">events</span>
                .<span class="ident">push</span>(<span class="ident">Event::PersonLeavesMap</span>(<span class="ident">trip</span>.<span class="ident">person</span>, <span class="prelude-val">Some</span>(<span class="ident">agent</span>), <span class="ident">i</span>));
        } <span class="kw">else</span> {
            <span class="macro">unreachable!</span>()
        }
        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::OffMap</span>;

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">trip_finished</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">car_or_bike_reached_border</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">car</span>: <span class="ident">CarID</span>,
        <span class="ident">i</span>: <span class="ident">IntersectionID</span>,
        <span class="ident">blocked_time</span>: <span class="ident">Duration</span>,
        <span class="ident">distance_crossed</span>: <span class="ident">Distance</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Car</span>(<span class="ident">car</span>)).<span class="ident">unwrap</span>().<span class="number">0</span>];
        <span class="ident">trip</span>.<span class="ident">total_blocked_time</span> <span class="op">+</span><span class="op">=</span> <span class="ident">blocked_time</span>;
        <span class="ident">trip</span>.<span class="ident">total_distance</span> <span class="op">+</span><span class="op">=</span> <span class="ident">distance_crossed</span>;

        <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>().<span class="ident">unwrap</span>() {
            <span class="ident">TripLeg::Drive</span>(<span class="ident">c</span>, <span class="ident">DrivingGoal::Border</span>(<span class="ident">int</span>, <span class="kw">_</span>)) =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">car</span>, <span class="ident">c</span>);
                <span class="macro">assert_eq!</span>(<span class="ident">i</span>, <span class="ident">int</span>);
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> <span class="op">=</span> <span class="ident">PersonState::OffMap</span>;
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripEndpoint::Border</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">end</span> {
            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonLeavesMap</span>(
                <span class="ident">trip</span>.<span class="ident">person</span>,
                <span class="prelude-val">Some</span>(<span class="ident">AgentID::Car</span>(<span class="ident">car</span>)),
                <span class="ident">i</span>,
            ));
        }

        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">id</span>;
        <span class="self">self</span>.<span class="ident">trip_finished</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">fn</span> <span class="ident">trip_finished</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">now</span>: <span class="ident">Time</span>, <span class="ident">id</span>: <span class="ident">TripID</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="macro">assert!</span>(<span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">is_empty</span>());
        <span class="macro">assert!</span>(<span class="op">!</span><span class="ident">trip</span>.<span class="ident">finished_at</span>.<span class="ident">is_some</span>());
        <span class="ident">trip</span>.<span class="ident">finished_at</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">now</span>);
        <span class="self">self</span>.<span class="ident">unfinished_trips</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>;
        <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::TripFinished</span> {
            <span class="ident">trip</span>: <span class="ident">trip</span>.<span class="ident">id</span>,
            <span class="ident">mode</span>: <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">mode</span>,
            <span class="ident">total_time</span>: <span class="ident">now</span> <span class="op">-</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">departure</span>,
            <span class="ident">blocked_time</span>: <span class="ident">trip</span>.<span class="ident">total_blocked_time</span>,
        });

        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">person</span>;
        <span class="self">self</span>.<span class="ident">start_delayed_trip</span>(<span class="ident">now</span>, <span class="ident">person</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">fn</span> <span class="ident">start_delayed_trip</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">now</span>: <span class="ident">Time</span>, <span class="ident">id</span>: <span class="ident">PersonID</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>) {
        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="kw">if</span> <span class="ident">person</span>.<span class="ident">delayed_trips</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span>;
        }
        <span class="kw">let</span> (<span class="ident">trip</span>, <span class="ident">args</span>) <span class="op">=</span> <span class="ident">person</span>.<span class="ident">delayed_trips</span>.<span class="ident">remove</span>(<span class="number">0</span>);
        <span class="kw">if</span> <span class="bool-val">false</span> {
            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::Alert</span>(
                <span class="ident">AlertLocation::Person</span>(<span class="ident">person</span>.<span class="ident">id</span>),
                <span class="macro">format!</span>(
                    <span class="string">&quot;{} just freed up, so starting delayed trip {}&quot;</span>,
                    <span class="ident">person</span>.<span class="ident">id</span>, <span class="ident">trip</span>
                ),
            ));
        }
        <span class="self">self</span>.<span class="ident">start_trip</span>(<span class="ident">now</span>, <span class="ident">trip</span>, <span class="ident">args</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">fn</span> <span class="ident">spawn_ped</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">now</span>: <span class="ident">Time</span>, <span class="ident">id</span>: <span class="ident">TripID</span>, <span class="ident">start</span>: <span class="ident">SidewalkSpot</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="kw">let</span> <span class="ident">walk_to</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
            <span class="ident">TripLeg::Walk</span>(<span class="kw-2">ref</span> <span class="ident">to</span>) =&gt; <span class="ident">to</span>.<span class="ident">clone</span>(),
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">PathRequest::walking</span>(<span class="ident">start</span>.<span class="ident">sidewalk_pos</span>, <span class="ident">walk_to</span>.<span class="ident">sidewalk_pos</span>);
        <span class="kw">match</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>) {
            <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; {
                <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>];
                <span class="ident">ctx</span>.<span class="ident">scheduler</span>.<span class="ident">push</span>(
                    <span class="ident">now</span>,
                    <span class="ident">Command::SpawnPed</span>(<span class="ident">CreatePedestrian</span> {
                        <span class="ident">id</span>: <span class="ident">person</span>.<span class="ident">ped</span>,
                        <span class="ident">speed</span>: <span class="ident">person</span>.<span class="ident">ped_speed</span>,
                        <span class="ident">start</span>,
                        <span class="ident">goal</span>: <span class="ident">walk_to</span>,
                        <span class="ident">path</span>,
                        <span class="ident">trip</span>: <span class="ident">id</span>,
                        <span class="ident">person</span>: <span class="ident">person</span>.<span class="ident">id</span>,
                    }),
                );
            }
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                <span class="self">self</span>.<span class="ident">cancel_trip</span>(<span class="ident">now</span>, <span class="ident">id</span>, <span class="ident">err</span>.<span class="ident">to_string</span>(), <span class="prelude-val">None</span>, <span class="ident">ctx</span>);
            }
        }
    }
}

<span class="comment">// Cancelling trips</span>
<span class="kw">impl</span> <span class="ident">TripManager</span> {
    <span class="doccomment">/// Cancel a trip before it&#39;s started. The person will stay where they are.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cancel_unstarted_trip</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">TripID</span>, <span class="ident">reason</span>: <span class="ident">String</span>) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="self">self</span>.<span class="ident">unfinished_trips</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>;
        <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">cancellation_reason</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">reason</span>);
        <span class="self">self</span>.<span class="ident">events</span>
            .<span class="ident">push</span>(<span class="ident">Event::TripCancelled</span>(<span class="ident">trip</span>.<span class="ident">id</span>, <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">mode</span>));
    }

    <span class="doccomment">/// Cancel a trip after it&#39;s started. The person will be magically warped to their destination,</span>
    <span class="doccomment">/// along with their car, as if the trip had completed normally.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cancel_trip</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">now</span>: <span class="ident">Time</span>,
        <span class="ident">id</span>: <span class="ident">TripID</span>,
        <span class="ident">reason</span>: <span class="ident">String</span>,
        <span class="ident">abandoned_vehicle</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vehicle</span><span class="op">&gt;</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Ctx</span>,
    ) {
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="self">self</span>.<span class="ident">unfinished_trips</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>;
        <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">cancellation_reason</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">reason</span>);
        <span class="self">self</span>.<span class="ident">events</span>
            .<span class="ident">push</span>(<span class="ident">Event::TripCancelled</span>(<span class="ident">trip</span>.<span class="ident">id</span>, <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">mode</span>));
        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">person</span>;

        <span class="comment">// Maintain consistentency for anyone listening to events</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">PersonState::Inside</span>(<span class="ident">b</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> {
            <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonLeavesBuilding</span>(<span class="ident">person</span>, <span class="ident">b</span>));
        }
        <span class="comment">// Warp to the destination</span>
        <span class="self">self</span>.<span class="ident">people</span>[<span class="ident">person</span>.<span class="number">0</span>].<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">end</span> {
            <span class="ident">TripEndpoint::Building</span>(<span class="ident">b</span>) =&gt; {
                <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonEntersBuilding</span>(<span class="ident">person</span>, <span class="ident">b</span>));
                <span class="ident">PersonState::Inside</span>(<span class="ident">b</span>)
            }
            <span class="ident">TripEndpoint::Border</span>(<span class="ident">i</span>) =&gt; {
                <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::PersonLeavesMap</span>(<span class="ident">person</span>, <span class="prelude-val">None</span>, <span class="ident">i</span>));
                <span class="ident">PersonState::OffMap</span>
            }
            <span class="comment">// Can&#39;t end trips here yet</span>
            <span class="ident">TripEndpoint::SuddenlyAppear</span>(<span class="kw">_</span>) =&gt; <span class="macro">unreachable!</span>(),
        };

        <span class="comment">// Don&#39;t forget the car!</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">vehicle</span>) <span class="op">=</span> <span class="ident">abandoned_vehicle</span> {
            <span class="kw">if</span> <span class="ident">vehicle</span>.<span class="ident">vehicle_type</span> <span class="op">==</span> <span class="ident">VehicleType::Car</span> {
                <span class="comment">// First remove the parked car, if needed. Maybe the trip was cancelled while the</span>
                <span class="comment">// car was parked in the starting building.</span>
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">parked_car</span>) <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">lookup_parked_car</span>(<span class="ident">vehicle</span>.<span class="ident">id</span>).<span class="ident">cloned</span>() {
                    <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">remove_parked_car</span>(<span class="ident">parked_car</span>);
                }

                <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripEndpoint::Building</span>(<span class="ident">b</span>) <span class="op">=</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">end</span> {
                    <span class="kw">let</span> <span class="ident">driving_lane</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">map</span>.<span class="ident">find_driving_lane_near_building</span>(<span class="ident">b</span>);
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">spot</span>) <span class="op">=</span> <span class="ident">ctx</span>
                        .<span class="ident">parking</span>
                        .<span class="ident">get_all_free_spots</span>(<span class="ident">Position::start</span>(<span class="ident">driving_lane</span>), <span class="kw-2">&amp;</span><span class="ident">vehicle</span>, <span class="ident">b</span>, <span class="ident">ctx</span>.<span class="ident">map</span>)
                        <span class="comment">// TODO Could pick something closer, but meh, cancelled trips are bugs</span>
                        <span class="comment">// anyway</span>
                        .<span class="ident">get</span>(<span class="number">0</span>)
                        .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">spot</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="kw-2">*</span><span class="ident">spot</span>)
                        .<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> {
                            <span class="ident">ctx</span>.<span class="ident">parking</span>
                                .<span class="ident">path_to_free_parking_spot</span>(<span class="ident">driving_lane</span>, <span class="kw-2">&amp;</span><span class="ident">vehicle</span>, <span class="ident">b</span>, <span class="ident">ctx</span>.<span class="ident">map</span>)
                                .<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">spot</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">spot</span>)
                        })
                    {
                        <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::Alert</span>(
                            <span class="ident">AlertLocation::Person</span>(<span class="ident">person</span>),
                            <span class="macro">format!</span>(
                                <span class="string">&quot;{} had a trip cancelled, and their car was warped to {:?}&quot;</span>,
                                <span class="ident">person</span>, <span class="ident">spot</span>
                            ),
                        ));
                        <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">reserve_spot</span>(<span class="ident">spot</span>, <span class="ident">vehicle</span>.<span class="ident">id</span>);
                        <span class="ident">ctx</span>.<span class="ident">parking</span>.<span class="ident">add_parked_car</span>(<span class="ident">ParkedCar</span> {
                            <span class="ident">vehicle</span>,
                            <span class="ident">spot</span>,
                            <span class="ident">parked_since</span>: <span class="ident">now</span>,
                        });
                    } <span class="kw">else</span> {
                        <span class="self">self</span>.<span class="ident">events</span>.<span class="ident">push</span>(<span class="ident">Event::Alert</span>(
                            <span class="ident">AlertLocation::Person</span>(<span class="ident">person</span>),
                            <span class="macro">format!</span>(
                                <span class="string">&quot;{} had a trip cancelled, but nowhere to warp their car! Sucks.&quot;</span>,
                                <span class="ident">person</span>
                            ),
                        ));
                    }
                }
            }
        } <span class="kw">else</span> {
            <span class="comment">// If the trip was cancelled because we&#39;e totally out of parking, don&#39;t forget to clean</span>
            <span class="comment">// this up.</span>
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripLeg::Drive</span>(<span class="ident">c</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">AgentID::Car</span>(<span class="kw-2">*</span><span class="ident">c</span>)) {
                    <span class="macro">assert_eq!</span>(<span class="ident">t</span>, <span class="ident">trip</span>.<span class="ident">id</span>);
                }
            }
        }

        <span class="self">self</span>.<span class="ident">start_delayed_trip</span>(<span class="ident">now</span>, <span class="ident">person</span>, <span class="ident">ctx</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trip_abruptly_cancelled</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">trip</span>: <span class="ident">TripID</span>, <span class="ident">agent</span>: <span class="ident">AgentID</span>) {
        <span class="macro">assert_eq!</span>(<span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">agent</span>), <span class="prelude-val">Some</span>(<span class="ident">trip</span>));
    }
}

<span class="comment">// Queries</span>
<span class="kw">impl</span> <span class="ident">TripManager</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">active_agents</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">AgentID</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">keys</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">active_agents_and_trips</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">AgentID</span>, <span class="ident">TripID</span><span class="op">&gt;</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">active_trip_mode</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_active_agents</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">len</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trip_to_agent</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">TripID</span>) -&gt; <span class="ident">TripResult</span><span class="op">&lt;</span><span class="ident">AgentID</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">id</span>.<span class="number">0</span> <span class="op">&gt;</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">trips</span>.<span class="ident">len</span>() {
            <span class="kw">return</span> <span class="ident">TripResult::TripDoesntExist</span>;
        }
        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];

        <span class="kw">if</span> <span class="ident">trip</span>.<span class="ident">finished_at</span>.<span class="ident">is_some</span>() {
            <span class="kw">return</span> <span class="ident">TripResult::TripDone</span>;
        }
        <span class="kw">if</span> <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">cancellation_reason</span>.<span class="ident">is_some</span>() {
            <span class="kw">return</span> <span class="ident">TripResult::TripCancelled</span>;
        }
        <span class="kw">if</span> <span class="op">!</span><span class="ident">trip</span>.<span class="ident">started</span> {
            <span class="kw">return</span> <span class="ident">TripResult::TripNotStarted</span>;
        }

        <span class="kw">let</span> <span class="ident">person</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">people</span>[<span class="ident">trip</span>.<span class="ident">person</span>.<span class="number">0</span>];
        <span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&amp;</span><span class="ident">trip</span>.<span class="ident">legs</span>[<span class="number">0</span>] {
            <span class="ident">TripLeg::Walk</span>(<span class="kw">_</span>) =&gt; <span class="ident">AgentID::Pedestrian</span>(<span class="ident">person</span>.<span class="ident">ped</span>),
            <span class="ident">TripLeg::Drive</span>(<span class="ident">c</span>, <span class="kw">_</span>) =&gt; <span class="ident">AgentID::Car</span>(<span class="kw-2">*</span><span class="ident">c</span>),
            <span class="ident">TripLeg::RideBus</span>(<span class="kw">_</span>, <span class="kw">_</span>) =&gt; <span class="ident">AgentID::BusPassenger</span>(<span class="ident">person</span>.<span class="ident">id</span>, <span class="ident">person</span>.<span class="ident">on_bus</span>.<span class="ident">unwrap</span>()),
        };
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">a</span>) <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>) {
            <span class="ident">TripResult::Ok</span>(<span class="ident">a</span>)
        } <span class="kw">else</span> {
            <span class="comment">//panic!(&quot;{} should be ongoing, but no agent in active_trip_mode&quot;, id);</span>
            <span class="ident">TripResult::ModeChange</span>
        }
    }

    <span class="doccomment">/// This will be None for parked cars and buses. Should always work for pedestrians.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">agent_to_trip</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">AgentID</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">TripID</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>).<span class="ident">cloned</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_trip</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">AgentID</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">id</span>) {
            <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">t</span>.<span class="number">0</span>];
            <span class="macro">println!</span>(<span class="string">&quot;{} has goal {:?}&quot;</span>, <span class="ident">trip</span>.<span class="ident">id</span>, <span class="ident">trip</span>.<span class="ident">legs</span>.<span class="ident">back</span>().<span class="ident">unwrap</span>());
        } <span class="kw">else</span> {
            <span class="macro">println!</span>(<span class="string">&quot;{} has no trip, must be parked car&quot;</span>, <span class="ident">id</span>);
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_trips</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="ident">usize</span>) {
        (
            <span class="self">self</span>.<span class="ident">trips</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">unfinished_trips</span>,
            <span class="self">self</span>.<span class="ident">unfinished_trips</span>,
        )
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_agents</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">transit</span>: <span class="kw-2">&amp;</span><span class="ident">TransitSimState</span>) -&gt; <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">AgentType</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="ident">Counter::new</span>();
        <span class="kw">for</span> <span class="ident">a</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">keys</span>() {
            <span class="ident">cnt</span>.<span class="ident">inc</span>(<span class="ident">a</span>.<span class="ident">to_type</span>());
        }
        <span class="kw">let</span> (<span class="ident">buses</span>, <span class="ident">trains</span>) <span class="op">=</span> <span class="ident">transit</span>.<span class="ident">active_vehicles</span>();
        <span class="ident">cnt</span>.<span class="ident">add</span>(<span class="ident">AgentType::Bus</span>, <span class="ident">buses</span>);
        <span class="ident">cnt</span>.<span class="ident">add</span>(<span class="ident">AgentType::Train</span>, <span class="ident">trains</span>);
        <span class="ident">cnt</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_commuters_vehicles</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">transit</span>: <span class="kw-2">&amp;</span><span class="ident">TransitSimState</span>,
        <span class="ident">walking</span>: <span class="kw-2">&amp;</span><span class="ident">WalkingSimState</span>,
    ) -&gt; <span class="ident">CommutersVehiclesCounts</span> {
        <span class="kw">let</span> (<span class="ident">buses</span>, <span class="ident">trains</span>) <span class="op">=</span> <span class="ident">transit</span>.<span class="ident">active_vehicles</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="ident">CommutersVehiclesCounts</span> {
            <span class="ident">walking_commuters</span>: <span class="number">0</span>,
            <span class="ident">walking_to_from_transit</span>: <span class="number">0</span>,
            <span class="ident">walking_to_from_car</span>: <span class="number">0</span>,
            <span class="ident">walking_to_from_bike</span>: <span class="number">0</span>,

            <span class="ident">cyclists</span>: <span class="number">0</span>,

            <span class="ident">sov_drivers</span>: <span class="number">0</span>,

            <span class="ident">buses</span>,
            <span class="ident">trains</span>,
            <span class="ident">bus_riders</span>: <span class="number">0</span>,
            <span class="ident">train_riders</span>: <span class="number">0</span>,
        };

        <span class="kw">for</span> <span class="ident">a</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">active_trip_mode</span>.<span class="ident">keys</span>() {
            <span class="kw">match</span> <span class="ident">a</span> {
                <span class="ident">AgentID::Car</span>(<span class="ident">c</span>) =&gt; <span class="kw">match</span> <span class="ident">c</span>.<span class="ident">vehicle_type</span> {
                    <span class="ident">VehicleType::Car</span> =&gt; {
                        <span class="ident">cnt</span>.<span class="ident">sov_drivers</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    <span class="ident">VehicleType::Bike</span> =&gt; {
                        <span class="ident">cnt</span>.<span class="ident">cyclists</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    <span class="ident">VehicleType::Bus</span> <span class="op">|</span> <span class="ident">VehicleType::Train</span> =&gt; <span class="macro">unreachable!</span>(),
                },
                <span class="ident">AgentID::BusPassenger</span>(<span class="kw">_</span>, <span class="ident">c</span>) =&gt; <span class="kw">match</span> <span class="ident">c</span>.<span class="ident">vehicle_type</span> {
                    <span class="ident">VehicleType::Bus</span> =&gt; {
                        <span class="ident">cnt</span>.<span class="ident">bus_riders</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    <span class="ident">VehicleType::Train</span> =&gt; {
                        <span class="ident">cnt</span>.<span class="ident">train_riders</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    <span class="ident">VehicleType::Car</span> <span class="op">|</span> <span class="ident">VehicleType::Bike</span> =&gt; <span class="macro">unreachable!</span>(),
                },
                <span class="comment">// These&#39;re counted separately</span>
                <span class="ident">AgentID::Pedestrian</span>(<span class="kw">_</span>) =&gt; {}
            }
        }
        <span class="ident">walking</span>.<span class="ident">populate_commuter_counts</span>(<span class="kw-2">&amp;mut</span> <span class="ident">cnt</span>);

        <span class="ident">cnt</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_ppl</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (<span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ppl_in_bldg</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ppl_off_map</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> <span class="ident">p</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">people</span> {
            <span class="kw">match</span> <span class="ident">p</span>.<span class="ident">state</span> {
                <span class="ident">PersonState::Trip</span>(<span class="kw">_</span>) =&gt; {}
                <span class="ident">PersonState::Inside</span>(<span class="kw">_</span>) =&gt; {
                    <span class="ident">ppl_in_bldg</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                }
                <span class="ident">PersonState::OffMap</span> =&gt; {
                    <span class="ident">ppl_off_map</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                }
            }
        }
        (<span class="self">self</span>.<span class="ident">people</span>.<span class="ident">len</span>(), <span class="ident">ppl_in_bldg</span>, <span class="ident">ppl_off_map</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_done</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">unfinished_trips</span> <span class="op">==</span> <span class="number">0</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trip_info</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">TripID</span>) -&gt; <span class="ident">TripInfo</span> {
        <span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>].<span class="ident">info</span>.<span class="ident">clone</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_trip_info</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">TripID</span>, <span class="ident">TripInfo</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">trips</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> (<span class="ident">t</span>.<span class="ident">id</span>, <span class="ident">t</span>.<span class="ident">info</span>.<span class="ident">clone</span>())).<span class="ident">collect</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">finished_trip_details</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">TripID</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">Duration</span>, <span class="ident">Duration</span>, <span class="ident">Distance</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="prelude-val">Some</span>((
            <span class="ident">t</span>.<span class="ident">finished_at</span><span class="question-mark">?</span> <span class="op">-</span> <span class="ident">t</span>.<span class="ident">info</span>.<span class="ident">departure</span>,
            <span class="ident">t</span>.<span class="ident">total_blocked_time</span>,
            <span class="ident">t</span>.<span class="ident">total_distance</span>,
        ))
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trip_blocked_time</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">TripID</span>) -&gt; <span class="ident">Duration</span> {
        <span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">id</span>.<span class="number">0</span>];
        <span class="ident">t</span>.<span class="ident">total_blocked_time</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bldg_to_people</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">b</span>: <span class="ident">BuildingID</span>) -&gt; <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">PersonID</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">people</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
        <span class="kw">for</span> <span class="ident">p</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">people</span> {
            <span class="kw">if</span> <span class="ident">p</span>.<span class="ident">state</span> <span class="op">==</span> <span class="ident">PersonState::Inside</span>(<span class="ident">b</span>) {
                <span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">p</span>.<span class="ident">id</span>);
            }
        }
        <span class="ident">people</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_person</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">p</span>: <span class="ident">PersonID</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">Person</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">people</span>.<span class="ident">get</span>(<span class="ident">p</span>.<span class="number">0</span>)
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_all_people</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Person</span><span class="op">&gt;</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">people</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trip_to_person</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">TripID</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">PersonID</span><span class="op">&gt;</span> {
        <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">trips</span>.<span class="ident">get</span>(<span class="ident">id</span>.<span class="number">0</span>)<span class="question-mark">?</span>.<span class="ident">person</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_arrivals_at_border</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">IntersectionID</span>) -&gt; <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Time</span>, <span class="ident">AgentType</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">times</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
        <span class="kw">for</span> <span class="ident">t</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span> {
            <span class="kw">if</span> <span class="ident">t</span>.<span class="ident">info</span>.<span class="ident">cancellation_reason</span>.<span class="ident">is_some</span>() {
                <span class="kw">continue</span>;
            }
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">TripEndpoint::Border</span>(<span class="ident">i</span>) <span class="op">=</span> <span class="ident">t</span>.<span class="ident">info</span>.<span class="ident">start</span> {
                <span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">at</span> {
                    <span class="comment">// We can make some assumptions here.</span>
                    <span class="kw">let</span> <span class="ident">agent_type</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">t</span>.<span class="ident">info</span>.<span class="ident">mode</span> {
                        <span class="ident">TripMode::Walk</span> =&gt; <span class="ident">AgentType::Pedestrian</span>,
                        <span class="ident">TripMode::Bike</span> =&gt; <span class="ident">AgentType::Bike</span>,
                        <span class="ident">TripMode::Drive</span> =&gt; <span class="ident">AgentType::Car</span>,
                        <span class="comment">// TODO Not true for long. People will be able to spawn at borders already</span>
                        <span class="comment">// on a bus.</span>
                        <span class="ident">TripMode::Transit</span> =&gt; <span class="ident">AgentType::Pedestrian</span>,
                    };
                    <span class="ident">times</span>.<span class="ident">push</span>((<span class="ident">t</span>.<span class="ident">info</span>.<span class="ident">departure</span>, <span class="ident">agent_type</span>));
                }
            }
        }
        <span class="ident">times</span>.<span class="ident">sort</span>();
        <span class="ident">times</span>
    }

    <span class="doccomment">/// Recreate the Scenario from an instantiated simulation. The results should match the</span>
    <span class="doccomment">/// original Scenario used.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">generate_scenario</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>, <span class="ident">name</span>: <span class="ident">String</span>) -&gt; <span class="ident">Scenario</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">scenario</span> <span class="op">=</span> <span class="ident">Scenario::empty</span>(<span class="ident">map</span>, <span class="kw-2">&amp;</span><span class="ident">name</span>);
        <span class="kw">for</span> <span class="ident">p</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">people</span> {
            <span class="ident">scenario</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">PersonSpec</span> {
                <span class="ident">orig_id</span>: <span class="ident">p</span>.<span class="ident">orig_id</span>,
                <span class="ident">trips</span>: <span class="ident">p</span>
                    .<span class="ident">trips</span>
                    .<span class="ident">iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> {
                        <span class="kw">let</span> <span class="ident">trip</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">trips</span>[<span class="ident">t</span>.<span class="number">0</span>];
                        <span class="ident">IndividTrip::new</span>(
                            <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">departure</span>,
                            <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">purpose</span>,
                            <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">start</span>,
                            <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">end</span>,
                            <span class="ident">trip</span>.<span class="ident">info</span>.<span class="ident">mode</span>,
                        )
                    })
                    .<span class="ident">collect</span>(),
            });
        }
        <span class="ident">scenario</span>
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">struct</span> <span class="ident">Trip</span> {
    <span class="ident">id</span>: <span class="ident">TripID</span>,
    <span class="ident">info</span>: <span class="ident">TripInfo</span>,
    <span class="ident">started</span>: <span class="ident">bool</span>,
    <span class="ident">finished_at</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Time</span><span class="op">&gt;</span>,
    <span class="ident">total_blocked_time</span>: <span class="ident">Duration</span>,
    <span class="ident">total_distance</span>: <span class="ident">Distance</span>,
    <span class="comment">// Not filled out until the trip starts</span>
    <span class="ident">legs</span>: <span class="ident">VecDeque</span><span class="op">&lt;</span><span class="ident">TripLeg</span><span class="op">&gt;</span>,
    <span class="ident">person</span>: <span class="ident">PersonID</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TripInfo</span> {
    <span class="doccomment">/// Scheduled departure; the start may be delayed if the previous trip is taking too long.</span>
    <span class="kw">pub</span> <span class="ident">departure</span>: <span class="ident">Time</span>,
    <span class="kw">pub</span> <span class="ident">mode</span>: <span class="ident">TripMode</span>,
    <span class="kw">pub</span> <span class="ident">start</span>: <span class="ident">TripEndpoint</span>,
    <span class="kw">pub</span> <span class="ident">end</span>: <span class="ident">TripEndpoint</span>,
    <span class="kw">pub</span> <span class="ident">purpose</span>: <span class="ident">TripPurpose</span>,
    <span class="doccomment">/// Did a ScenarioModifier apply to this?</span>
    <span class="kw">pub</span> <span class="ident">modified</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">cancellation_reason</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Trip</span> {
    <span class="kw">fn</span> <span class="ident">assert_walking_leg</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">goal</span>: <span class="ident">SidewalkSpot</span>) {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">legs</span>.<span class="ident">pop_front</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">TripLeg::Walk</span>(<span class="ident">spot</span>)) =&gt; {
                <span class="macro">assert_eq!</span>(<span class="ident">goal</span>, <span class="ident">spot</span>);
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        }
    }
}

<span class="doccomment">/// These don&#39;t specify where the leg starts, since it might be unknown -- like when we drive and</span>
<span class="doccomment">/// don&#39;t know where we&#39;ll wind up parking.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">PartialEq</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum</span> <span class="ident">TripLeg</span> {
    <span class="ident">Walk</span>(<span class="ident">SidewalkSpot</span>),
    <span class="doccomment">/// A person may own many vehicles, so specify which they use</span>
    <span class="ident">Drive</span>(<span class="ident">CarID</span>, <span class="ident">DrivingGoal</span>),
    <span class="doccomment">/// Maybe get off at a stop, maybe ride off-map</span>
    <span class="ident">RideBus</span>(<span class="ident">TransitRouteID</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">TransitStopID</span><span class="op">&gt;</span>),
}

<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">TripResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="prelude-val">Ok</span>(<span class="ident">T</span>),
    <span class="ident">ModeChange</span>,
    <span class="ident">TripDone</span>,
    <span class="ident">TripDoesntExist</span>,
    <span class="ident">TripNotStarted</span>,
    <span class="ident">TripCancelled</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">TripResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ok</span>(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">TripResult::Ok</span>(<span class="ident">data</span>) =&gt; <span class="prelude-val">Some</span>(<span class="ident">data</span>),
            <span class="kw">_</span> =&gt; <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">propagate_error</span><span class="op">&lt;</span><span class="ident">X</span><span class="op">&gt;</span>(<span class="self">self</span>) -&gt; <span class="ident">TripResult</span><span class="op">&lt;</span><span class="ident">X</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">TripResult::Ok</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(<span class="string">&quot;TripResult is Ok, can&#39;t propagate_error&quot;</span>),
            <span class="ident">TripResult::ModeChange</span> =&gt; <span class="ident">TripResult::ModeChange</span>,
            <span class="ident">TripResult::TripDone</span> =&gt; <span class="ident">TripResult::TripDone</span>,
            <span class="ident">TripResult::TripDoesntExist</span> =&gt; <span class="ident">TripResult::TripDoesntExist</span>,
            <span class="ident">TripResult::TripNotStarted</span> =&gt; <span class="ident">TripResult::TripNotStarted</span>,
            <span class="ident">TripResult::TripCancelled</span> =&gt; <span class="ident">TripResult::TripCancelled</span>,
        }
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Person</span> {
    <span class="kw">pub</span> <span class="ident">id</span>: <span class="ident">PersonID</span>,
    <span class="kw">pub</span> <span class="ident">orig_id</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">OrigPersonID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">trips</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">TripID</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">state</span>: <span class="ident">PersonState</span>,

    <span class="kw">pub</span> <span class="ident">ped</span>: <span class="ident">PedestrianID</span>,
    <span class="kw">pub</span> <span class="ident">ped_speed</span>: <span class="ident">Speed</span>,
    <span class="doccomment">/// Both cars and bikes</span>
    <span class="kw">pub</span> <span class="ident">vehicles</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vehicle</span><span class="op">&gt;</span>,

    <span class="ident">delayed_trips</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">TripID</span>, <span class="ident">StartTripArgs</span>)<span class="op">&gt;</span>,
    <span class="ident">on_bus</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CarID</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Person</span> {
    <span class="kw">fn</span> <span class="ident">get_vehicle</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">CarID</span>) -&gt; <span class="ident">Vehicle</span> {
        <span class="self">self</span>.<span class="ident">vehicles</span>.<span class="ident">iter</span>().<span class="ident">find</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span>.<span class="ident">id</span> <span class="op">==</span> <span class="ident">id</span>).<span class="ident">unwrap</span>().<span class="ident">clone</span>()
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">PartialEq</span>, <span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">PersonState</span> {
    <span class="ident">Trip</span>(<span class="ident">TripID</span>),
    <span class="ident">Inside</span>(<span class="ident">BuildingID</span>),
    <span class="ident">OffMap</span>,
}

<span class="doccomment">/// The number of active vehicles and commuters, broken into different categories.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CommutersVehiclesCounts</span> {
    <span class="kw">pub</span> <span class="ident">walking_commuters</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">walking_to_from_transit</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">walking_to_from_car</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">walking_to_from_bike</span>: <span class="ident">usize</span>,

    <span class="kw">pub</span> <span class="ident">cyclists</span>: <span class="ident">usize</span>,

    <span class="kw">pub</span> <span class="ident">sov_drivers</span>: <span class="ident">usize</span>,

    <span class="kw">pub</span> <span class="ident">buses</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">trains</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">bus_riders</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">train_riders</span>: <span class="ident">usize</span>,
}
</code></pre></div>
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