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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/map_parking.html"><strong aria-hidden="true">2.1.</strong> How to map on-street parking</a></li><li class="chapter-item expanded "><a href="../howto/new_city.html"><strong aria-hidden="true">2.2.</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" class="active"><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"><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></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></ol>
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<h1><a class="header" href="#west-seattle-mitigations" id="west-seattle-mitigations">West Seattle mitigations</a></h1>
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<p><em>Draft, updated June 23, 2020 by Dustin Carlino (<a href="mailto:dabreegster@gmail.com">dabreegster@gmail.com</a>)</em></p>
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<p>In March 2020, the West Seattle bridge was closed due to cracks forming. As of
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May, COVID-19's impact on commuting means the area still hasn't seen how the
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area will handle losing the main route to the rest of Seattle. A local group,
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HPAC, published a list of
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<a href="https://www.westsideseattle.com/robinson-papers/2020/05/04/highland-park-action-coalition-calls-seattle-officials-traffic">requests to SDOT</a>
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to prepare the area for these changes.</p>
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<p>This page will try to explore some of the problems and solutions from HPAC's
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document using <a href="https://abstreet.org">A/B Street</a>, a traffic simulator designed
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to explore the impacts of changes like this on different modes of
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transportation.</p>
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<blockquote>
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<p><strong><em>NOTE:</em></strong> You might want to read <a href="../how_it_works.html">how A/B Street works</a>
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first.</p>
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</blockquote>
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<h2><a class="header" href="#16th-ave-sw-and-sw-holden-st" id="16th-ave-sw-and-sw-holden-st">16th Ave SW and SW Holden St</a></h2>
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<p>HPAC has been asking for a protected left-turn stage at this intersection. I'm
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unfamiliar with this intersection and currently unable to scout in-person, so
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I'm blindly guessing the traffic signal currently has just two stages:</p>
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<p><img src="existing_diagram.gif" alt="existing_diagram" /></p>
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<p>From watching the traffic, it seems like the east/west direction is busier, with
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lots of eastbound traffic headed towards WA-509. Holden St has no turn lanes, so
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a protected left turn stage makes sense. Let's make the change and see what
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happens:</p>
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<iframe width="560" height="315" src="https://www.youtube.com/embed/6tooJaZLa0Q" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
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<p>Unfortuately, we can't evaluate the change yet, because the simulation gets
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stuck with unrealistic traffic jams in other parts of the map. This is mostly
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due to data quality issues in OpenStreetMap and incorrectly guessed traffic
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signal timings. These problems can be fixed with the help of somebody familiar
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with the area.</p>
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<h2><a class="header" href="#re-evaluate-arterials" id="re-evaluate-arterials">Re-evaluate arterials</a></h2>
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<p>The 9th item from HPAC's list asks for measuring the amount of east-west traffic
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to figure out what streets people are using as arterials. That's an easy
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analysis, using the <em>throughput</em> layer.</p>
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<iframe width="560" height="315" src="https://www.youtube.com/embed/yzp9c7gHhOI" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
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<p>By 6am, the busiest streets include Admiral Way, S Charlestown, SW Genesee, SW
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Alaska, SW Holden, and SW Roxbury St. Again, it's necessary to first fix data
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quality problems and run a full day before doing more analysis.</p>
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<p>Once the simulation is running smoothly, A/B Street can be used to make changes
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-- like lowering speed limits, adding a protected left turn stage, or converting
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part of the road into a bus lane -- and evaluate the effects on individual trips
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and aggregate groups.</p>
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<h2><a class="header" href="#repair-the-bridge" id="repair-the-bridge">Repair the bridge</a></h2>
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<p>Community proposals now includes a "repair the bridge" option, which should
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restore things to how they were before March 2020. This is useful as a baseline,
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to explore what traffic patterns were like before the closure.</p>
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