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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">IndividTrip</span>, <span class="ident">PersonID</span>, <span class="ident">PersonSpec</span>, <span class="ident">Scenario</span>, <span class="ident">ScenarioGenerator</span>, <span class="ident">SpawnTrip</span>, <span class="ident">TripEndpoint</span>,
    <span class="ident">TripMode</span>,
};
<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">prettyprint_usize</span>, <span class="ident">Parallelism</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Distance</span>, <span class="ident">Duration</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">BuildingType</span>, <span class="ident">Map</span>, <span class="ident">PathConstraints</span>, <span class="ident">PathRequest</span>};
<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">seq</span>::<span class="ident">SliceRandom</span>;
<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">Rng</span>;
<span class="kw">use</span> <span class="ident">rand_xorshift</span>::<span class="ident">XorShiftRng</span>;

<span class="kw">impl</span> <span class="ident">ScenarioGenerator</span> {
    <span class="comment">// Designed in https://github.com/dabreegster/abstreet/issues/154</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">proletariat_robot</span>(<span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>, <span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Scenario</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">residents</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">BuildingID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">workers</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">BuildingID</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_bldg_residential</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_bldg_commercial</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_bldg_mixed_residential_commercial</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">all_buildings</span>() {
            <span class="kw">match</span> <span class="ident">b</span>.<span class="ident">bldg_type</span> {
                <span class="ident">BuildingType</span>::<span class="ident">Residential</span>(<span class="ident">resident_cap</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">resident_cap</span> {
                        <span class="ident">residents</span>.<span class="ident">push</span>(<span class="ident">b</span>.<span class="ident">id</span>);
                    }
                    <span class="ident">num_bldg_residential</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                }
                <span class="ident">BuildingType</span>::<span class="ident">ResidentialCommercial</span>(<span class="ident">resident_cap</span>, <span class="ident">worker_cap</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">resident_cap</span> {
                        <span class="ident">residents</span>.<span class="ident">push</span>(<span class="ident">b</span>.<span class="ident">id</span>);
                    }
                    <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">worker_cap</span> {
                        <span class="ident">workers</span>.<span class="ident">push</span>(<span class="ident">b</span>.<span class="ident">id</span>);
                    }
                    <span class="ident">num_bldg_mixed_residential_commercial</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                }
                <span class="ident">BuildingType</span>::<span class="ident">Commercial</span>(<span class="ident">worker_cap</span>) <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">worker_cap</span> {
                        <span class="ident">workers</span>.<span class="ident">push</span>(<span class="ident">b</span>.<span class="ident">id</span>);
                    }
                    <span class="ident">num_bldg_commercial</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                }
                <span class="ident">BuildingType</span>::<span class="ident">Empty</span> <span class="op">=</span><span class="op">&gt;</span> {}
            }
        }

        <span class="ident">residents</span>.<span class="ident">shuffle</span>(<span class="ident">rng</span>);
        <span class="ident">workers</span>.<span class="ident">shuffle</span>(<span class="ident">rng</span>);

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Scenario</span>::<span class="ident">empty</span>(<span class="ident">map</span>, <span class="string">&quot;random people going to/from work&quot;</span>);
        <span class="comment">// Include all buses/trains</span>
        <span class="ident">s</span>.<span class="ident">only_seed_buses</span> <span class="op">=</span> <span class="prelude-val">None</span>;

        <span class="kw">let</span> <span class="ident">residents_cap</span> <span class="op">=</span> <span class="ident">residents</span>.<span class="ident">len</span>();
        <span class="kw">let</span> <span class="ident">workers_cap</span> <span class="op">=</span> <span class="ident">workers</span>.<span class="ident">len</span>();

        <span class="comment">// this saturation figure is an arbitrary guess - we assume that the number of trips will</span>
        <span class="comment">// scale as some factor of the people living and/or working on the map. A number of more</span>
        <span class="comment">// than 1.0 will primarily affect the number of &quot;pass through&quot; trips - people who neither</span>
        <span class="comment">// work nor live in the neighborhood.</span>
        <span class="kw">let</span> <span class="ident">trip_saturation</span> <span class="op">=</span> <span class="number">1.2</span>;
        <span class="kw">let</span> <span class="ident">num_trips</span> <span class="op">=</span> (<span class="ident">trip_saturation</span> <span class="op">*</span> (<span class="ident">residents_cap</span> <span class="op">+</span> <span class="ident">workers_cap</span>) <span class="kw">as</span> <span class="ident">f64</span>) <span class="kw">as</span> <span class="ident">usize</span>;

        <span class="comment">// bound probabilities to ensure we&#39;re getting some diveristy of agents</span>
        <span class="kw">let</span> <span class="ident">lower_bound_prob</span> <span class="op">=</span> <span class="number">0.05</span>;
        <span class="kw">let</span> <span class="ident">upper_bound_prob</span> <span class="op">=</span> <span class="number">0.90</span>;
        <span class="kw">let</span> <span class="ident">prob_local_resident</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">workers_cap</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
            <span class="ident">lower_bound_prob</span>
        } <span class="kw">else</span> {
            <span class="ident">f64</span>::<span class="ident">min</span>(
                <span class="ident">upper_bound_prob</span>,
                <span class="ident">f64</span>::<span class="ident">max</span>(<span class="ident">lower_bound_prob</span>, <span class="ident">residents_cap</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> <span class="ident">num_trips</span> <span class="kw">as</span> <span class="ident">f64</span>),
            )
        };
        <span class="kw">let</span> <span class="ident">prob_local_worker</span> <span class="op">=</span> <span class="ident">f64</span>::<span class="ident">min</span>(
            <span class="ident">upper_bound_prob</span>,
            <span class="ident">f64</span>::<span class="ident">max</span>(<span class="ident">lower_bound_prob</span>, <span class="ident">workers_cap</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> <span class="ident">num_trips</span> <span class="kw">as</span> <span class="ident">f64</span>),
        );

        <span class="macro">debug</span><span class="macro">!</span>(
            <span class="string">&quot;BUILDINGS - workplaces: {}, residences: {}, mixed: {}&quot;</span>,
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_bldg_commercial</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_bldg_residential</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_bldg_mixed_residential_commercial</span>)
        );
        <span class="macro">debug</span><span class="macro">!</span>(
            <span class="string">&quot;CAPACITY - workers_cap: {}, residents_cap: {}, prob_local_worker: {:.1}%, \
             prob_local_resident: {:.1}%&quot;</span>,
            <span class="ident">prettyprint_usize</span>(<span class="ident">workers_cap</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">residents_cap</span>),
            <span class="ident">prob_local_worker</span> <span class="op">*</span> <span class="number">100.</span>,
            <span class="ident">prob_local_resident</span> <span class="op">*</span> <span class="number">100.</span>
        );

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_trips_local</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_trips_commuting_in</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_trips_commuting_out</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num_trips_passthru</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;create people&quot;</span>);

        <span class="comment">// Only consider two-way intersections, so the agent can return the same way</span>
        <span class="comment">// they came.</span>
        <span class="comment">// TODO: instead, if it&#39;s not a two-way border, we should find an intersection</span>
        <span class="comment">// an incoming border &quot;near&quot; the outgoing border, to allow a broader set of</span>
        <span class="comment">// realistic options.</span>
        <span class="comment">// TODO: prefer larger thoroughfares to better reflect reality.</span>
        <span class="kw">let</span> <span class="ident">commuter_borders</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">TripEndpoint</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">map</span>
            .<span class="ident">all_outgoing_borders</span>()
            .<span class="ident">into_iter</span>()
            .<span class="ident">filter</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span>.<span class="ident">is_incoming_border</span>())
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">TripEndpoint</span>::<span class="ident">Border</span>(<span class="ident">b</span>.<span class="ident">id</span>, <span class="prelude-val">None</span>))
            .<span class="ident">collect</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">commuter_borders</span>.<span class="ident">len</span>() <span class="op">&gt;</span> <span class="number">0</span>);
        <span class="kw">let</span> <span class="ident">person_params</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">num_trips</span>)
            .<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> {
                <span class="kw">let</span> (<span class="ident">is_local_resident</span>, <span class="ident">is_local_worker</span>) <span class="op">=</span> (
                    <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="ident">prob_local_resident</span>),
                    <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="ident">prob_local_worker</span>),
                );
                <span class="kw">let</span> <span class="ident">home</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">is_local_resident</span> {
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">residence</span>) <span class="op">=</span> <span class="ident">residents</span>.<span class="ident">pop</span>() {
                        <span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="ident">residence</span>)
                    } <span class="kw">else</span> {
                        <span class="ident">commuter_borders</span>.<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">clone</span>()
                    }
                } <span class="kw">else</span> {
                    <span class="ident">commuter_borders</span>.<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">clone</span>()
                };

                <span class="kw">let</span> <span class="ident">work</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">is_local_worker</span> {
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">workplace</span>) <span class="op">=</span> <span class="ident">workers</span>.<span class="ident">pop</span>() {
                        <span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="ident">workplace</span>)
                    } <span class="kw">else</span> {
                        <span class="ident">commuter_borders</span>.<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">clone</span>()
                    }
                } <span class="kw">else</span> {
                    <span class="ident">commuter_borders</span>.<span class="ident">choose</span>(<span class="ident">rng</span>).<span class="ident">unwrap</span>().<span class="ident">clone</span>()
                };

                <span class="kw">match</span> (<span class="kw-2">&amp;</span><span class="ident">home</span>, <span class="kw-2">&amp;</span><span class="ident">work</span>) {
                    (<span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="kw">_</span>), <span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="kw">_</span>)) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">num_trips_local</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    (<span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="kw">_</span>), <span class="ident">TripEndpoint</span>::<span class="ident">Border</span>(<span class="kw">_</span>, <span class="kw">_</span>)) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">num_trips_commuting_out</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    (<span class="ident">TripEndpoint</span>::<span class="ident">Border</span>(<span class="kw">_</span>, <span class="kw">_</span>), <span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="kw">_</span>)) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">num_trips_commuting_in</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                    (<span class="ident">TripEndpoint</span>::<span class="ident">Border</span>(<span class="kw">_</span>, <span class="kw">_</span>), <span class="ident">TripEndpoint</span>::<span class="ident">Border</span>(<span class="kw">_</span>, <span class="kw">_</span>)) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="ident">num_trips_passthru</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                    }
                };

                (<span class="ident">home</span>, <span class="ident">work</span>, <span class="ident">abstutil</span>::<span class="ident">fork_rng</span>(<span class="ident">rng</span>))
            })
            .<span class="ident">collect</span>();

        <span class="ident">timer</span>
            .<span class="ident">parallelize</span>(
                <span class="string">&quot;create people: making PersonSpec from endpoints&quot;</span>,
                <span class="ident">Parallelism</span>::<span class="ident">Fastest</span>,
                <span class="ident">person_params</span>,
                <span class="op">|</span>(<span class="ident">home</span>, <span class="ident">work</span>, <span class="kw-2">mut</span> <span class="ident">rng</span>)<span class="op">|</span> <span class="kw">match</span> <span class="ident">create_prole</span>(<span class="kw-2">&amp;</span><span class="ident">home</span>, <span class="kw-2">&amp;</span><span class="ident">work</span>, <span class="ident">map</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">rng</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">person</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">person</span>),
                    <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=</span><span class="op">&gt;</span> {
                        <span class="macro">trace</span><span class="macro">!</span>(<span class="string">&quot;Unable to create person. error: {}&quot;</span>, <span class="ident">e</span>);
                        <span class="prelude-val">None</span>
                    }
                },
            )
            .<span class="ident">into_iter</span>()
            .<span class="ident">flatten</span>()
            .<span class="ident">for_each</span>(<span class="op">|</span><span class="kw-2">mut</span> <span class="ident">person</span><span class="op">|</span> {
                <span class="ident">person</span>.<span class="ident">id</span> <span class="op">=</span> <span class="ident">PersonID</span>(<span class="ident">s</span>.<span class="ident">people</span>.<span class="ident">len</span>());
                <span class="ident">s</span>.<span class="ident">people</span>.<span class="ident">push</span>(<span class="ident">person</span>);
            });

        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;create people&quot;</span>);

        <span class="macro">info</span><span class="macro">!</span>(
            <span class="string">&quot;TRIPS - total: {}, local: {}, commuting_in: {}, commuting_out: {}, passthru: {}, \
             errored: {}, leftover_resident_capacity: {}, leftover_worker_capacity: {}&quot;</span>,
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_trips</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_trips_local</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_trips_commuting_in</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_trips_commuting_out</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_trips_passthru</span>),
            <span class="ident">prettyprint_usize</span>(<span class="ident">num_trips</span> <span class="op">-</span> <span class="ident">s</span>.<span class="ident">people</span>.<span class="ident">len</span>()),
            <span class="ident">prettyprint_usize</span>(<span class="ident">residents</span>.<span class="ident">len</span>()),
            <span class="ident">prettyprint_usize</span>(<span class="ident">workers</span>.<span class="ident">len</span>()),
        );
        <span class="ident">s</span>
    }
}

<span class="kw">fn</span> <span class="ident">create_prole</span>(
    <span class="ident">home</span>: <span class="kw-2">&amp;</span><span class="ident">TripEndpoint</span>,
    <span class="ident">work</span>: <span class="kw-2">&amp;</span><span class="ident">TripEndpoint</span>,
    <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
    <span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">PersonSpec</span>, <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span><span class="op">&gt;</span><span class="op">&gt;</span> {
    <span class="kw">if</span> <span class="ident">home</span> <span class="op">=</span><span class="op">=</span> <span class="ident">work</span> {
        <span class="comment">// TODO: handle edge-case of working and living in the same building...  maybe more likely</span>
        <span class="comment">// to go for a walk later in the day or something</span>
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">&quot;TODO: handle working and living in the same building&quot;</span>.<span class="ident">into</span>());
    }

    <span class="kw">let</span> <span class="ident">mode</span> <span class="op">=</span> <span class="kw">match</span> (<span class="ident">home</span>, <span class="ident">work</span>) {
        <span class="comment">// commuting entirely within map</span>
        (<span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="ident">home_bldg</span>), <span class="ident">TripEndpoint</span>::<span class="ident">Bldg</span>(<span class="ident">work_bldg</span>)) <span class="op">=</span><span class="op">&gt;</span> {
            <span class="comment">// Decide mode based on walking distance. If the buildings aren&#39;t connected,</span>
            <span class="comment">// probably a bug in importing; just skip this person.</span>
            <span class="kw">let</span> <span class="ident">dist</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">dist</span>) <span class="op">=</span> <span class="ident">map</span>
                .<span class="ident">pathfind</span>(<span class="ident">PathRequest</span> {
                    <span class="ident">start</span>: <span class="ident">map</span>.<span class="ident">get_b</span>(<span class="kw-2">*</span><span class="ident">home_bldg</span>).<span class="ident">sidewalk_pos</span>,
                    <span class="ident">end</span>: <span class="ident">map</span>.<span class="ident">get_b</span>(<span class="kw-2">*</span><span class="ident">work_bldg</span>).<span class="ident">sidewalk_pos</span>,
                    <span class="ident">constraints</span>: <span class="ident">PathConstraints</span>::<span class="ident">Pedestrian</span>,
                })
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">p</span>.<span class="ident">total_length</span>())
            {
                <span class="ident">dist</span>
            } <span class="kw">else</span> {
                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="string">&quot;no path found&quot;</span>.<span class="ident">into</span>());
            };

            <span class="comment">// TODO If home or work is in an access-restricted zone (like a living street),</span>
            <span class="comment">// then probably don&#39;t drive there. Actually, it depends on the specific tagging;</span>
            <span class="comment">// access=no in the US usually means a gated community.</span>
            <span class="ident">select_trip_mode</span>(<span class="ident">dist</span>, <span class="ident">rng</span>)
        }
        <span class="comment">// if you exit or leave the map, we assume driving</span>
        <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="ident">TripMode</span>::<span class="ident">Drive</span>,
    };

    <span class="comment">// TODO This will cause a single morning and afternoon rush. Outside of these times,</span>
    <span class="comment">// it&#39;ll be really quiet. Probably want a normal distribution centered around these</span>
    <span class="comment">// peak times, but with a long tail.</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">depart_am</span> <span class="op">=</span> <span class="ident">rand_time</span>(
        <span class="ident">rng</span>,
        <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">7</span>),
        <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">10</span>),
    );
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">depart_pm</span> <span class="op">=</span> <span class="ident">rand_time</span>(
        <span class="ident">rng</span>,
        <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">17</span>),
        <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">19</span>),
    );

    <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="number">0.1</span>) {
        <span class="comment">// hacky hack to get some background traffic</span>
        <span class="ident">depart_am</span> <span class="op">=</span> <span class="ident">rand_time</span>(
            <span class="ident">rng</span>,
            <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">0</span>),
            <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">12</span>),
        );
        <span class="ident">depart_pm</span> <span class="op">=</span> <span class="ident">rand_time</span>(
            <span class="ident">rng</span>,
            <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">12</span>),
            <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">hours</span>(<span class="number">24</span>),
        );
    }

    <span class="kw">let</span> <span class="ident">goto_work</span> <span class="op">=</span> <span class="ident">SpawnTrip</span>::<span class="ident">new</span>(<span class="ident">home</span>.<span class="ident">clone</span>(), <span class="ident">work</span>.<span class="ident">clone</span>(), <span class="ident">mode</span>, <span class="ident">map</span>)
        .<span class="ident">ok_or</span>(<span class="string">&quot;unable to spawn &#39;goto work&#39; trip&quot;</span>)<span class="question-mark">?</span>;
    <span class="kw">let</span> <span class="ident">return_home</span> <span class="op">=</span> <span class="ident">SpawnTrip</span>::<span class="ident">new</span>(<span class="ident">work</span>.<span class="ident">clone</span>(), <span class="ident">home</span>.<span class="ident">clone</span>(), <span class="ident">mode</span>, <span class="ident">map</span>)
        .<span class="ident">ok_or</span>(<span class="string">&quot;unable to spawn &#39;return home&#39; trip&quot;</span>)<span class="question-mark">?</span>;

    <span class="prelude-val">Ok</span>(<span class="ident">PersonSpec</span> {
        <span class="comment">// Fix this outside the parallelism</span>
        <span class="ident">id</span>: <span class="ident">PersonID</span>(<span class="number">0</span>),
        <span class="ident">orig_id</span>: <span class="prelude-val">None</span>,
        <span class="ident">trips</span>: <span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">IndividTrip</span>::<span class="ident">new</span>(<span class="ident">depart_am</span>, <span class="ident">goto_work</span>),
            <span class="ident">IndividTrip</span>::<span class="ident">new</span>(<span class="ident">depart_pm</span>, <span class="ident">return_home</span>),
        ],
    })
}

<span class="kw">fn</span> <span class="ident">select_trip_mode</span>(<span class="ident">distance</span>: <span class="ident">Distance</span>, <span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">TripMode</span> {
    <span class="comment">// TODO Make this probabilistic</span>
    <span class="comment">// for example probability of walking currently has massive differences</span>
    <span class="comment">// at thresholds, it would be nicer to change this gradually</span>
    <span class="comment">// TODO - do not select based on distance but select one that is fastest/best in the</span>
    <span class="comment">// given situation excellent bus connection / plenty of parking /</span>
    <span class="comment">// cycleways / suitable rail connection all strongly influence</span>
    <span class="comment">// selected mode of transport, distance is not the sole influence</span>
    <span class="comment">// in some cities there may case where driving is only possible method</span>
    <span class="comment">// to get somewhere, even at a short distance</span>

    <span class="comment">// Always walk for really short trips</span>
    <span class="kw">if</span> <span class="ident">distance</span> <span class="op">&lt;</span> <span class="ident">Distance</span>::<span class="ident">miles</span>(<span class="number">0.5</span>) {
        <span class="kw">return</span> <span class="ident">TripMode</span>::<span class="ident">Walk</span>;
    }

    <span class="comment">// Sometimes bike or walk for moderate trips</span>
    <span class="kw">if</span> <span class="ident">distance</span> <span class="op">&lt;</span> <span class="ident">Distance</span>::<span class="ident">miles</span>(<span class="number">3.0</span>) {
        <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="number">0.15</span>) {
            <span class="kw">return</span> <span class="ident">TripMode</span>::<span class="ident">Bike</span>;
        }
        <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="number">0.05</span>) {
            <span class="kw">return</span> <span class="ident">TripMode</span>::<span class="ident">Walk</span>;
        }
    }

    <span class="comment">// For longer trips, maybe bike for dedicated cyclists</span>
    <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="number">0.005</span>) {
        <span class="kw">return</span> <span class="ident">TripMode</span>::<span class="ident">Bike</span>;
    }
    <span class="comment">// Try transit if available, or fallback to walking</span>
    <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="number">0.3</span>) {
        <span class="kw">return</span> <span class="ident">TripMode</span>::<span class="ident">Transit</span>;
    }

    <span class="comment">// Most of the time, just drive</span>
    <span class="ident">TripMode</span>::<span class="ident">Drive</span>
}

<span class="kw">fn</span> <span class="ident">rand_time</span>(<span class="ident">rng</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">XorShiftRng</span>, <span class="ident">low</span>: <span class="ident">Time</span>, <span class="ident">high</span>: <span class="ident">Time</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
    <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">high</span> <span class="op">&gt;</span> <span class="ident">low</span>);
    <span class="ident">Time</span>::<span class="ident">START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="ident">rng</span>.<span class="ident">gen_range</span>(<span class="ident">low</span>.<span class="ident">inner_seconds</span>(), <span class="ident">high</span>.<span class="ident">inner_seconds</span>()))
}
</pre></div>
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