mirror of
https://github.com/a-b-street/abstreet.git
synced 2024-12-25 23:43:25 +03:00
325 lines
21 KiB
HTML
325 lines
21 KiB
HTML
<!DOCTYPE HTML>
|
|
<html lang="en" class="sidebar-visible no-js light">
|
|
<head>
|
|
<!-- Book generated using mdBook -->
|
|
<meta charset="UTF-8">
|
|
<title>Travel demand - A/B Street</title>
|
|
|
|
|
|
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
|
|
<meta name="description" content="">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
<meta name="theme-color" content="#ffffff" />
|
|
|
|
<link rel="shortcut icon" href="../favicon.png">
|
|
<link rel="stylesheet" href="../css/variables.css">
|
|
<link rel="stylesheet" href="../css/general.css">
|
|
<link rel="stylesheet" href="../css/chrome.css">
|
|
<link rel="stylesheet" href="../css/print.css" media="print">
|
|
|
|
<!-- Fonts -->
|
|
<link rel="stylesheet" href="../FontAwesome/css/font-awesome.css">
|
|
<link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css">
|
|
<link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:500" rel="stylesheet" type="text/css">
|
|
|
|
<!-- Highlight.js Stylesheets -->
|
|
<link rel="stylesheet" href="../highlight.css">
|
|
<link rel="stylesheet" href="../tomorrow-night.css">
|
|
<link rel="stylesheet" href="../ayu-highlight.css">
|
|
|
|
<!-- Custom theme stylesheets -->
|
|
|
|
|
|
|
|
</head>
|
|
<body>
|
|
<!-- Provide site root to javascript -->
|
|
<script type="text/javascript">
|
|
var path_to_root = "../";
|
|
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
|
|
</script>
|
|
|
|
<!-- Work around some values being stored in localStorage wrapped in quotes -->
|
|
<script type="text/javascript">
|
|
try {
|
|
var theme = localStorage.getItem('mdbook-theme');
|
|
var sidebar = localStorage.getItem('mdbook-sidebar');
|
|
|
|
if (theme.startsWith('"') && theme.endsWith('"')) {
|
|
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
|
|
}
|
|
|
|
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
|
|
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
|
|
}
|
|
} catch (e) { }
|
|
</script>
|
|
|
|
<!-- Set the theme before any content is loaded, prevents flash -->
|
|
<script type="text/javascript">
|
|
var theme;
|
|
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
|
|
if (theme === null || theme === undefined) { theme = default_theme; }
|
|
var html = document.querySelector('html');
|
|
html.classList.remove('no-js')
|
|
html.classList.remove('light')
|
|
html.classList.add(theme);
|
|
html.classList.add('js');
|
|
</script>
|
|
|
|
<!-- Hide / unhide sidebar before it is displayed -->
|
|
<script type="text/javascript">
|
|
var html = document.querySelector('html');
|
|
var sidebar = 'hidden';
|
|
if (document.body.clientWidth >= 1080) {
|
|
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
|
|
sidebar = sidebar || 'visible';
|
|
}
|
|
html.classList.remove('sidebar-visible');
|
|
html.classList.add("sidebar-" + sidebar);
|
|
</script>
|
|
|
|
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
|
|
<div class="sidebar-scrollbox">
|
|
<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"><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><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" class="active"><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>
|
|
</div>
|
|
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
|
|
</nav>
|
|
|
|
<div id="page-wrapper" class="page-wrapper">
|
|
|
|
<div class="page">
|
|
|
|
<div id="menu-bar-hover-placeholder"></div>
|
|
<div id="menu-bar" class="menu-bar sticky bordered">
|
|
<div class="left-buttons">
|
|
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
|
|
<i class="fa fa-bars"></i>
|
|
</button>
|
|
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
|
|
<i class="fa fa-paint-brush"></i>
|
|
</button>
|
|
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
|
|
<li role="none"><button role="menuitem" class="theme" id="light">Light (default)</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
|
|
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
|
|
</ul>
|
|
|
|
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
|
|
<i class="fa fa-search"></i>
|
|
</button>
|
|
|
|
</div>
|
|
|
|
<h1 class="menu-title">A/B Street</h1>
|
|
|
|
<div class="right-buttons">
|
|
<a href="../print.html" title="Print this book" aria-label="Print this book">
|
|
<i id="print-button" class="fa fa-print"></i>
|
|
</a>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div id="search-wrapper" class="hidden">
|
|
<form id="searchbar-outer" class="searchbar-outer">
|
|
<input type="search" name="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
|
|
</form>
|
|
<div id="searchresults-outer" class="searchresults-outer hidden">
|
|
<div id="searchresults-header" class="searchresults-header"></div>
|
|
<ul id="searchresults">
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
|
|
<script type="text/javascript">
|
|
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
|
|
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
|
|
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
|
|
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
|
|
});
|
|
</script>
|
|
|
|
<div id="content" class="content">
|
|
<main>
|
|
<h1><a class="header" href="#travel-demand" id="travel-demand">Travel demand</a></h1>
|
|
<p>A/B Street simulates people following a schedule of trips over a day. A single
|
|
<em>trip</em> has a start and endpoint, a departure time, and a mode. Most trips go
|
|
between buildings, but the start or endpoint may also be a border intersection
|
|
to represent something outside the map boundaries. The mode specifies whether
|
|
the person will walk, bike, drive, or use transit. Without a good set of people
|
|
and trips, evaluating some changes to a map is hard -- what if the traffic
|
|
patterns near the change aren't realistic to begin with? This chapter describes
|
|
where the travel demand data comes from.</p>
|
|
<h2><a class="header" href="#scenarios" id="scenarios">Scenarios</a></h2>
|
|
<p>A <em>scenario</em> encodes the people and trips taken over a day. See the
|
|
<a href="https://github.com/dabreegster/abstreet/blob/master/sim/src/make/scenario.rs">code</a>.</p>
|
|
<p>TODO:</p>
|
|
<ul>
|
|
<li>talk about vehicle assignment / parked car seeding</li>
|
|
</ul>
|
|
<h2><a class="header" href="#data-sources" id="data-sources">Data sources</a></h2>
|
|
<h3><a class="header" href="#seattle-soundcast" id="seattle-soundcast">Seattle: Soundcast</a></h3>
|
|
<p>Seattle luckily has the Puget Sound Regional Council, which has produced the
|
|
<a href="https://www.psrc.org/activity-based-travel-model-soundcast">Soundcast model</a>.
|
|
They use census stats, land parcel records, observed vehicle counts, travel
|
|
diaries, and lots of other things I don't understand to produce a detailed model
|
|
of the region. We're currently using their 2014 model; the 2018 one should be
|
|
available sometime in 2020. See the
|
|
<a href="https://github.com/dabreegster/abstreet/tree/master/importer/src/soundcast">code</a>
|
|
for importing their data.</p>
|
|
<p>TODO:</p>
|
|
<ul>
|
|
<li>talk about how trips beginning/ending off-map are handled</li>
|
|
</ul>
|
|
<h3><a class="header" href="#berlin" id="berlin">Berlin</a></h3>
|
|
<p>This work is <a href="https://github.com/dabreegster/abstreet/issues/119">ongoing</a>. See
|
|
the
|
|
<a href="https://github.com/dabreegster/abstreet/blob/master/importer/src/berlin.rs">code</a>.
|
|
So far, we've found a population count per planning area and are randomly
|
|
distributing the number of residents to all residential buildings in each area.</p>
|
|
<h3><a class="header" href="#proletariat-robot" id="proletariat-robot">Proletariat robot</a></h3>
|
|
<p>What if we just want to generate a reasonable model without any city-specific
|
|
data? One of the simplest approaches is just to spawn people beginning at
|
|
residential buildings, make them go to some workplace in the morning, then
|
|
return in the evening. OpenStreetMap building tags can be used to roughly
|
|
classify building types and distinguish small houses from large apartments. See
|
|
the <code>proletariat_robot</code>
|
|
<a href="https://github.com/dabreegster/abstreet/blob/master/sim/src/make/activity_model.rs">code</a>
|
|
for an implementation of this.</p>
|
|
<p>This is <a href="https://github.com/dabreegster/abstreet/issues/154">ongoing</a> work
|
|
spearheaded by Mateusz. Some of the ideas for next steps are to generate
|
|
different types of people (students, workers), give them a set of activities
|
|
with durations (go to school for 7 hours, 1 hour lunch break), and then further
|
|
pick specfic buildings to travel to using more OSM tags.</p>
|
|
<h3><a class="header" href="#custom-import" id="custom-import">Custom import</a></h3>
|
|
<p>If you have your own data, you can import it. The input format is JSON -- an
|
|
example:</p>
|
|
<pre><code>{
|
|
"scenario_name": "monday",
|
|
"people": [
|
|
{
|
|
"origin": {
|
|
"longitude": -122.303723,
|
|
"latitude": 47.6372834
|
|
},
|
|
"trips": [
|
|
{
|
|
"departure": 10800.0,
|
|
"position": {
|
|
"longitude": -122.3075948,
|
|
"latitude": 47.6394773
|
|
},
|
|
"mode": "Drive"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>Run the tool:</p>
|
|
<pre><code>cargo run --bin import_traffic -- --map=data/system/maps/montlake.bin --input=/path/to/input.json
|
|
</code></pre>
|
|
<p>The tool matches input positions to the nearest building or border intersection,
|
|
within 100 meters. The <code>departure</code> time is seconds since midnight. The tool will
|
|
fail if any point doesn't match to a building, or if any of the specified trips
|
|
can't be created (due to graph connectivity problems, for example). If your
|
|
requirements are different or you have any trouble using this format/tool,
|
|
please file a Github issue -- just consider this tool and format a prototype.</p>
|
|
<h2><a class="header" href="#modifying-demand" id="modifying-demand">Modifying demand</a></h2>
|
|
<p>The travel demand model is extremely fixed; the main effect of a different
|
|
random number seed is currently to initially place parked cars in specific
|
|
spots. When the player makes changes to the map, exactly the same people and
|
|
trips are simulated, and we just measure how trip time changes. This is a very
|
|
short-term prediction. If it becomes much more convenient to bike or bus
|
|
somewhere, then more people will do it over time. How can we transform the
|
|
original demand model to respond to these changes?</p>
|
|
<p>Right now, there's very preliminary work in sandbox mode for Seattle weekday
|
|
scenarios. You can cancel all trips for some people (simulating lockdown) or
|
|
modify the mode for some people (change 50% of all driving trips between 7 and
|
|
9am to use transit).</p>
|
|
<h2><a class="header" href="#research" id="research">Research</a></h2>
|
|
<ul>
|
|
<li><a href="https://github.com/replicahq/doppelganger">https://github.com/replicahq/doppelganger</a></li>
|
|
<li><a href="https://github.com/stasmix/popsynth">https://github.com/stasmix/popsynth</a></li>
|
|
<li><a href="https://zephyrtransport.github.io/zephyr-directory/projects/">https://zephyrtransport.github.io/zephyr-directory/projects/</a></li>
|
|
<li><a href="https://activitysim.github.io">https://activitysim.github.io</a></li>
|
|
<li><a href="https://github.com/BayAreaMetro/travel-model-one">https://github.com/BayAreaMetro/travel-model-one</a></li>
|
|
<li><a href="https://github.com/RSGInc/DaySim">https://github.com/RSGInc/DaySim</a></li>
|
|
<li><a href="https://github.com/arup-group/pam">https://github.com/arup-group/pam</a></li>
|
|
</ul>
|
|
|
|
</main>
|
|
|
|
<nav class="nav-wrapper" aria-label="Page navigation">
|
|
<!-- Mobile navigation buttons -->
|
|
|
|
<a rel="prev" href="../trafficsim/discrete_event.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
|
<i class="fa fa-angle-left"></i>
|
|
</a>
|
|
|
|
|
|
|
|
<a rel="next" href="../trafficsim/gridlock.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
|
<i class="fa fa-angle-right"></i>
|
|
</a>
|
|
|
|
|
|
<div style="clear: both"></div>
|
|
</nav>
|
|
</div>
|
|
</div>
|
|
|
|
<nav class="nav-wide-wrapper" aria-label="Page navigation">
|
|
|
|
<a rel="prev" href="../trafficsim/discrete_event.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
|
<i class="fa fa-angle-left"></i>
|
|
</a>
|
|
|
|
|
|
|
|
<a rel="next" href="../trafficsim/gridlock.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
|
<i class="fa fa-angle-right"></i>
|
|
</a>
|
|
|
|
</nav>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript">
|
|
window.playpen_copyable = true;
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<script src="../elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="../mark.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="../searcher.js" type="text/javascript" charset="utf-8"></script>
|
|
|
|
|
|
<script src="../clipboard.min.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="../highlight.js" type="text/javascript" charset="utf-8"></script>
|
|
<script src="../book.js" type="text/javascript" charset="utf-8"></script>
|
|
|
|
<!-- Custom JS scripts -->
|
|
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|