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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" class="active"><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"><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/importing/index.html"><strong aria-hidden="true">6.1.</strong> Importing</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../map/importing/convert_osm.html"><strong aria-hidden="true">6.1.1.</strong> convert_osm</a></li><li class="chapter-item expanded "><a href="../map/importing/geometry.html"><strong aria-hidden="true">6.1.2.</strong> Road/intersection geometry</a></li><li class="chapter-item expanded "><a href="../map/importing/rest.html"><strong aria-hidden="true">6.1.3.</strong> The rest</a></li></ol></li><li class="chapter-item expanded "><a href="../map/edits.html"><strong aria-hidden="true">6.2.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="../map/misc.html"><strong aria-hidden="true">6.3.</strong> Misc</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 class="menu-title">A/B Street</h1>
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<h1><a class="header" href="#lake-washington-blvd-stay-healthy-street" id="lake-washington-blvd-stay-healthy-street">Lake Washington Blvd Stay Healthy Street</a></h1>
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<p><em>Draft, updated May 7, 2020 by Dustin Carlino (<a href="mailto:dabreegster@gmail.com">dabreegster@gmail.com</a>)</em></p>
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<p>In April 2020, Seattle Department of Transportation started rolling out
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<a href="https://sdotblog.seattle.gov/2020/04/16/announcing-stay-healthy-streets/">Stay Healthy Streets</a>,
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restricting roads to through-traffic to give people walking and biking more
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space for social distancing.
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<a href="http://seattlegreenways.org/socialdistancingstreets/">Seattle Neighborhood Greenways</a>
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soon proposed extending this to a
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<a href="https://drive.google.com/open?id=1HQMnagRf8EbS1nouqCMLl4LZr0QE8VrC&usp=sharing">130-mile network</a>.</p>
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<p>Selecting the streets requires some planning:</p>
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<blockquote>
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<p>These streets were selected to amplify outdoor exercise opportunities for
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areas with limited open space options, low car ownership and routes connecting
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people to essential services and food take out. We also ensured street
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closures did not impact newly opened food pick up loading zones, parking
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around hospitals for service for health care professionals, and bus routes.</p>
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</blockquote>
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<p>I've spent the last two years building <a href="https://abstreet.org">A/B Street</a>,
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software to explore the impacts of changes like this on different modes of
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transportation. So, let's try implementing part of the proposed network and see
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what happens!</p>
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<blockquote>
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<p><strong><em>NOTE:</em></strong> You might want to read
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<a href="https://github.com/dabreegster/abstreet/blob/master/old_docs/how_it_works.md">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="#lake-washington-blvd" id="lake-washington-blvd">Lake Washington Blvd</a></h2>
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<p>Let's start with one part of the proposal, closing Lake Washington Blvd to cars
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through the Arboretum. There's already a multi-use trail alongside this stretch,
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but its width makes it difficult to maintain 6 feet from people. There are some
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parking lots that become inaccessible with this proposal, but they're currently
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closed anyway.</p>
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<p><img src="edits.gif" alt="edits" /></p>
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<h3><a class="header" href="#first-attempt" id="first-attempt">First attempt</a></h3>
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<iframe width="560" height="315" src="https://www.youtube.com/embed/PU0iT-_3-es" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
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<p>Let's get started! If you want to follow along,
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<a href="https://github.com/dabreegster/abstreet/blob/master/old_docs/INSTRUCTIONS.md">install A/B Street</a>,
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open sandbox mode, and switch the map to Lake Washington corridor. Zoom in on
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the southern tip of the Arboretum and hop into edit mode. We can see Lake
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Washington Blvd just has one travel lane in each direction here. Click each
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lane, convert it to a bike lane, and repeat north until Foster Island Road.</p>
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<p>When we leave edit mode, the traffic simulation resets to midnight. Nothing
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really interesting happens until 5 or 6am, so we'll speed up time. Watching the
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section of road we edited, we'll only see pedestrians and bikes use this stretch
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of road. If we want, we can click an individual person and follow along their
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journey.</p>
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<iframe width="560" height="315" src="https://www.youtube.com/embed/LSCHeDi5484" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
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<p>Something's weird though. There's lots of traffic cutting northbound through the
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neighborhood, along 29th, Ward, and 28th. We can open up the throughput layer to
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find which roads have the most traffic. More usefully, we can select "compare
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before edits" to see what roads are getting more or less traffic because of the
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road we modified. As expected, there's much less traffic along Lake Wash Blvd,
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but it's also clear that lots of cars are now cutting through 26th Ave E.</p>
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<h3><a class="header" href="#traffic-calming" id="traffic-calming">Traffic calming</a></h3>
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<iframe width="560" height="315" src="https://www.youtube.com/embed/qAf5IAMbpcU" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
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<p>Let's say you want to nudge traffic to use 23rd Ave, the nearest north/south
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arterial, instead. (A/B Street is an unopinionated tool; if you have a different
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goal in mind, try using it for that instead.) In this simulation, drivers pick
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the fastest route, so we could try lowering speed limits or make some of the
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residential streets connecting to Madison one-way, discouraging through-traffic.
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In reality, the speed limit changes could be implemented through
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<a href="https://streetsillustrated.seattle.gov/design-standards/trafficcalming/">traffic calming</a>
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or cheap, temporary alternatives.</p>
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<h2><a class="header" href="#next-steps" id="next-steps">Next steps</a></h2>
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<p>I'm working to model "local access only" roads in A/B Street, and I'll describe
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how to measure the impact on travel times. Stay tuned to see more of the
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<a href="https://drive.google.com/open?id=1HQMnagRf8EbS1nouqCMLl4LZr0QE8VrC&usp=sharing">proposed network</a>
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simulated, and get in touch if you'd like to help out!</p>
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