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<ol class="chapter"><li class="chapter-item expanded "><a href="../index.html"><strong aria-hidden="true">1.</strong> Overview</a></li><li class="chapter-item expanded "><a href="../howto/index.html"><strong aria-hidden="true">2.</strong> Instructions</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../howto/new_city.html"><strong aria-hidden="true">2.1.</strong> Importing a new city</a></li></ol></li><li class="chapter-item expanded "><a href="../how_it_works.html"><strong aria-hidden="true">3.</strong> How it works</a></li><li class="chapter-item expanded "><a href="../case_studies/index.html"><strong aria-hidden="true">4.</strong> Case studies</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../case_studies/lake_wash.html"><strong aria-hidden="true">4.1.</strong> Lake Washington Blvd Stay Healthy Street</a></li><li class="chapter-item expanded "><a href="../case_studies/west_seattle.html"><strong aria-hidden="true">4.2.</strong> West Seattle mitigations</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../dev/index.html"><strong aria-hidden="true">5.</strong> Developer guide</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../dev/misc_tricks.html"><strong aria-hidden="true">5.1.</strong> Misc developer tricks</a></li><li class="chapter-item expanded "><a href="../dev/api.html" class="active"><strong aria-hidden="true">5.2.</strong> API</a></li><li class="chapter-item expanded "><a href="../dev/testing.html"><strong aria-hidden="true">5.3.</strong> Testing</a></li><li class="chapter-item expanded "><a href="../dev/mass_import.html"><strong aria-hidden="true">5.4.</strong> Importing many maps</a></li><li class="chapter-item expanded "><a href="../dev/data.html"><strong aria-hidden="true">5.5.</strong> Data organization</a></li></ol></li><li class="chapter-item expanded "><a href="../map/index.html"><strong aria-hidden="true">6.</strong> Map model</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../map/details.html"><strong aria-hidden="true">6.1.</strong> Details</a></li><li class="chapter-item expanded "><a href="../map/importing/index.html"><strong aria-hidden="true">6.2.</strong> Importing</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../map/importing/convert_osm.html"><strong aria-hidden="true">6.2.1.</strong> convert_osm</a></li><li class="chapter-item expanded "><a href="../map/importing/geometry.html"><strong aria-hidden="true">6.2.2.</strong> Road/intersection geometry</a></li><li class="chapter-item expanded "><a href="../map/importing/rest.html"><strong aria-hidden="true">6.2.3.</strong> The rest</a></li><li class="chapter-item expanded "><a href="../map/importing/misc.html"><strong aria-hidden="true">6.2.4.</strong> Misc</a></li></ol></li><li class="chapter-item expanded "><a href="../map/edits.html"><strong aria-hidden="true">6.3.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="../map/platform.html"><strong aria-hidden="true">6.4.</strong> Exporting</a></li></ol></li><li class="chapter-item expanded "><a href="../trafficsim/index.html"><strong aria-hidden="true">7.</strong> Traffic simulation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../trafficsim/discrete_event.html"><strong aria-hidden="true">7.1.</strong> Discrete event simulation</a></li><li class="chapter-item expanded "><a href="../trafficsim/travel_demand.html"><strong aria-hidden="true">7.2.</strong> Travel demand</a></li><li class="chapter-item expanded "><a href="../trafficsim/gridlock.html"><strong aria-hidden="true">7.3.</strong> Gridlock</a></li><li class="chapter-item expanded "><a href="../trafficsim/trips.html"><strong aria-hidden="true">7.4.</strong> Multi-modal trips</a></li><li class="chapter-item expanded "><a href="../trafficsim/live_edits.html"><strong aria-hidden="true">7.5.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="../trafficsim/parking.html"><strong aria-hidden="true">7.6.</strong> Parking</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../project/index.html"><strong aria-hidden="true">8.</strong> Project</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../project/roadmap.html"><strong aria-hidden="true">8.1.</strong> Roadmap</a></li><li class="chapter-item expanded "><a href="../project/motivations.html"><strong aria-hidden="true">8.2.</strong> Motivations</a></li><li class="chapter-item expanded "><a href="../project/history/index.html"><strong aria-hidden="true">8.3.</strong> History</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../project/history/backstory.html"><strong aria-hidden="true">8.3.1.</strong> Backstory</a></li><li class="chapter-item expanded "><a href="../project/history/year1.html"><strong aria-hidden="true">8.3.2.</strong> Year 1</a></li><li class="chapter-item expanded "><a href="../project/history/year2.html"><strong aria-hidden="true">8.3.3.</strong> Year 2</a></li><li class="chapter-item expanded "><a href="../project/history/year3.html"><strong aria-hidden="true">8.3.4.</strong> Year 3</a></li></ol></li><li class="chapter-item expanded "><a href="../project/CHANGELOG.html"><strong aria-hidden="true">8.4.</strong> Full CHANGELOG</a></li><li class="chapter-item expanded "><a href="../project/references.html"><strong aria-hidden="true">8.5.</strong> References</a></li><li class="chapter-item expanded "><a href="../project/collaborations.html"><strong aria-hidden="true">8.6.</strong> Collaborations</a></li></ol></li><li class="chapter-item expanded "><a href="../side_projects/index.html"><strong aria-hidden="true">9.</strong> Side projects</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../side_projects/parking_mapper.html"><strong aria-hidden="true">9.1.</strong> Mapping on-street parking</a></li><li class="chapter-item expanded "><a href="../side_projects/osm_viewer.html"><strong aria-hidden="true">9.2.</strong> OpenStreetMap viewer</a></li><li class="chapter-item expanded "><a href="../side_projects/fifteen_min.html"><strong aria-hidden="true">9.3.</strong> 15-minute neighborhoods explorer</a></li></ol></li></ol>
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<h1 class="menu-title">A/B Street</h1>
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<h1><a class="header" href="#api" id="api">API</a></h1>
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<p>Suppose you're tired of manually fiddling with traffic signals, and you want to
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use machine learning to do it. You can run A/B Street without graphics and
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automatically control it through an API.</p>
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<h2><a class="header" href="#examples" id="examples">Examples</a></h2>
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<p>This
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<a href="https://github.com/dabreegster/abstreet/blob/master/headless/examples/python_client.py">Python example</a>
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has everything you need to get started.</p>
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<p>See
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<a href="https://github.com/dabreegster/abstreet/tree/master/headless/examples">all example code</a>
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-- there are different experiments in Go and Python that automate running a
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simulation, measuring some metric, and making a change to improve the metric.</p>
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<h2><a class="header" href="#control-flow" id="control-flow">Control flow</a></h2>
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<p>The <code>headless</code> API server that you run contains a single map and simulation at a
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time. Even though you can theoretically have multiple clients make requests to
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it simultaneously, the server will only execute one at a time. If you're trying
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to do something other than use one script to make API calls in sequence, please
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get in touch, so we can figure out something better suited to your use case.</p>
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<p>When you start the <code>headless</code> server, it always loads the <code>montlake</code> map with
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the <code>weekday</code> scenario. The only way you can change this is by calling
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<code>/sim/load</code>. For example:</p>
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<pre><code>curl http://localhost:1234/sim/load -d '{ "scenario": "data/system/seattle/scenarios/downtown/monday.bin", "modifiers": [], "edits": null }' -X POST`
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</code></pre>
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<p>You can also pass flags like <code>--infinite_parking</code> to the server to control
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<a href="https://dabreegster.github.io/abstreet/rustdoc/sim/struct.SimOptions.html">SimOptions</a>.
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These settings will apply for the entire lifetime of the server; you can't
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change them later.</p>
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<h2><a class="header" href="#api-details" id="api-details">API details</a></h2>
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<blockquote>
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<p><strong>Under construction</strong>: The API will keep changing. There are no backwards
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compatibility guarantees yet. Please make sure I know about your project, so I
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don't break your client code.</p>
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</blockquote>
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<p>For now, the API is JSON over HTTP. The exact format is unspecified, error codes
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are missing, etc. A summary of the commands available so far:</p>
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<ul>
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<li><strong>/sim</strong>
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<ul>
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<li><strong>GET /sim/reset</strong>: Reset all temporary map edits and the simulation state.
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The trips that will run don't change; they're determined by the scenario
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specified by the last call to <code>/sim/load</code>. If you made live map edits using
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things like <code>/traffic-signals/set</code>, they'll be reset to the <code>edits</code> from
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<code>/sim/load</code>.</li>
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<li><strong>POST /sim/load</strong>: Switch the scenario being simulated, and also optionally
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sets the map edits.</li>
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<li><strong>GET /sim/get-time</strong>: Returns the current simulation time.</li>
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<li><strong>GET /sim/goto-time?t=06:30:00</strong>: Simulate until 6:30 AM. If the time you
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specify is before the current time, you have to call <strong>/sim/reset</strong> first.</li>
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<li><strong>POST /sim/new-person</strong>: The POST body must be an
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<a href="https://dabreegster.github.io/abstreet/rustdoc/sim/struct.ExternalPerson.html">ExternalPerson</a>
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in JSON format.</li>
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</ul>
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</li>
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<li><strong>/traffic-signals</strong>
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<ul>
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<li><strong>GET /traffic-signals/get?id=42</strong>: Returns the traffic signal of
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intersection #42 in JSON.</li>
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<li><strong>POST /traffic-signals/set</strong>: The POST body must be a
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<a href="https://dabreegster.github.io/abstreet/rustdoc/map_model/struct.ControlTrafficSignal.html">ControlTrafficSignal</a>
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in JSON format.</li>
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<li><strong>GET /traffic-signals/get-delays?id=42&t1=03:00:00&t2=03:30:00</strong>: Returns
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the delay experienced by every agent passing through intersection #42 from
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3am to 3:30, grouped by direction of travel.</li>
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<li><strong>GET /traffic-signals/get-cumulative-thruput?id=42</strong>: Returns the number of
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agents passing through intersection #42 since midnight, grouped by direction
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of travel.</li>
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<li><strong>GET /traffic-signals/get-all-current-state</strong>: Returns the current state of
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all traffic signals, including the stage timing, waiting, and accepted
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agents.</li>
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</ul>
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</li>
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<li><strong>/data</strong>
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<ul>
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<li><strong>GET /data/get-finished-trips</strong>: Returns a JSON list of all finished trips.
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Each tuple is (time the trip finished in seconds after midnight, trip ID,
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mode, duration of trip in seconds). The mode is a string like "Walk" or
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"Drive". If the trip was cancelled for any reason, duration will be null.</li>
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<li><strong>GET /data/get-agent-positions</strong>: Returns a JSON list of all active agents.
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Vehicle type (or pedestrian), person ID, and position is included.</li>
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<li><strong>GET /data/get-road-thruput</strong>: Returns a JSON list of (road, agent type,
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hour since midnight, throughput for that one hour period).</li>
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<li><strong>GET /data/get-blocked-by-graph</strong>: Returns a mapping from agent IDs to how
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long they've been waiting and why they're blocked.</li>
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<li><strong>GET /data/trip-time-lower-bound?id=123</strong>: Returns a reasonable lower bound
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for the total duration of trip 123, in seconds. The time is calculated
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assuming no delay at intersections, travelling full speed along every road,
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and using the primary mode for the entire trip (so just driving).</li>
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</ul>
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</li>
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<li><strong>/map</strong>
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<ul>
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<li><strong>GET /map/get-edits</strong>: Returns the current map edits in JSON. You can save
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this to a file in <code>data/player/edits/city_name/map_name/</code> and later use it
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in-game normally. You can also later run the <code>headless</code> server with
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<code>--edits=name_of_edits</code>.</li>
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<li><strong>GET /map/get-edit-road-command?id=123</strong>: Returns an object that can be
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modified and then added to map edits.</li>
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<li><strong>GET /map/get-intersection-geometry?id=123</strong>: Returns a GeoJSON object with
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one feature for the intersection and a feature for all connecting roads. The
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polygon coordinates are measured in meters, with the origin centered at the
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intersection's center.</li>
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<li><strong>GET /map/get-all-geometry</strong>: Returns a huge GeoJSON object with one
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feature per road and intersection in the map. The coordinate space is WGS84.</li>
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</ul>
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</li>
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</ul>
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<h2><a class="header" href="#working-with-the-map-model" id="working-with-the-map-model">Working with the map model</a></h2>
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<p>If you need to deeply inspect the map, you can dump it to JSON:</p>
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<pre><code>cargo run --bin dump_map data/system/seattle/maps/montlake.bin > montlake.json
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</code></pre>
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<p>See some example code that
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<a href="https://github.com/dabreegster/abstreet/blob/master/headless/examples/generate_traffic.py">reads this JSON and finds buildings</a>.</p>
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<p>You could also edit the map JSON, convert it back to binary, and use it in the
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simulation. This isn't recommended generally, but one possible use case could be
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tuning the amount of offstreet parking per building. The map JSON has a list
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called <code>buildings</code>, and each object there has a field <code>parking</code>. You coud set
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this object to <code>{ "Private": [100, false] }</code> to indicate 100 parking spots, for
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a building not explicitly designated in OpenStreetMap as a garage. After editing
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the JSON, you have to convert it back to the binary format:</p>
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<pre><code>cargo run --bin json_to_binary_map -- --input=montlake.json out=data/system/seattle/maps/montlake_modified.bin`
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</code></pre>
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<p>... Except this tool doesn't seem to work yet!</p>
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<p>The format of the map isn't well-documented yet. See the
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<a href="https://dabreegster.github.io/abstreet/rustdoc/map_model/index.html">generated API docs</a>
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and <a href="../map/index.html">the map model docs</a> in the meantime.</p>
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<h2><a class="header" href="#working-with-individual-trips" id="working-with-individual-trips">Working with individual trips</a></h2>
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<p>You can use the <strong>/sim/new-person</strong> API in the middle of a simulation, if
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needed. If possible, it's simpler to create a Scenario as input.</p>
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<h2><a class="header" href="#working-with-scenarios" id="working-with-scenarios">Working with Scenarios</a></h2>
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<p>You can
|
|
<a href="../trafficsim/travel_demand.html#custom-import">import trips from your own data</a>.</p>
|
|
<p>You can also generate different variations of one of the
|
|
<a href="../trafficsim/travel_demand.html#proletariat-robot">demand models</a> by specifying
|
|
an RNG seed:</p>
|
|
<pre><code>cargo run --bin random_scenario -- --rng=123 --map=data/system/seattle/maps/montlake.bin --scenario_name=home_to_work
|
|
</code></pre>
|
|
<p>You can also dump Scenarios (the file that defines all of the people and trips)
|
|
to JSON:</p>
|
|
<pre><code>cargo run --bin dump_scenario data/system/seattle/scenarios/montlake/weekday.bin > montlake_weekday.json
|
|
</code></pre>
|
|
<p>You can modify the JSON, then put the file back in the appropriate directory and
|
|
use it in-game:</p>
|
|
<pre><code>cargo run --bin game data/system/seattle/scenarios/montlake/modified_scenario.json
|
|
</code></pre>
|
|
<p>The Scenario format is also undocumented, but see the
|
|
<a href="https://dabreegster.github.io/abstreet/rustdoc/sim/struct.Scenario.html">generated API docs</a>
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