Design Considerations for Real-time Arterial Performance Measurement Systems Using Transit Bus Probes
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1 Design Considerations for Real-time Arterial Performance Measurement Systems Using Transit Bus Probes Abraham Emmanuel & David Zavattero Chicago Department of Transportation
2 Project Goals Estimate traffic conditions on 300 miles of strategic arterials in Chicago Inform public and emergency responders of current traffic conditions Mitigate congestion by diverting traffic away from congested street segments
3 Many Possible Data Sources Bus data is readily available and easily accessible at the least cost to the city
4 Key Features I N P U T O U T P U T Bus reports its location, odometer speed and a few other parameters every 30 seconds to a central server Real-time data from over 2,300 buses provides reasonable coverage of city s principal arterials PROCESS Generate congestion map Compute travel times for traffic alerts and Variable Message Signs
5 Data Source Data Collected by CTA for Bus Tracker System Leveraged network connection between City & CTA
6 Route Selection CTA Bus Routes Chicago Strategic Arterial Network
7 Segment the Network Roughly half mile segments One segment for each direction of travel 300 * 1/2 * 2 = 1,200 segments Determine latitude and longitude boundaries for each segment ( GEO- FENCE )
8 Identify buses on each segment Bus reports its position (lat/long) & direction of travel Each segment has its lat/long boundary
9 Convert Bus Data to Congestion Estimation Based on the travel the buses made on the segment in the last 10 minutes On average about 8-10 bus reads per segment Convert bus data to traffic condition Extension of the Portland State University method (max odometer speed from all the bus reads on a segment is roughly equal to the speed of cars on the segment) Estimated speed on a segment is compared to city speed limits on that segment to determine congestion
10 Color Coded Map 0 to 10mph: Red 10 to 20: Yellow Over 20: Green
11 Travel Time Estimation Congestion Estimation process calculates speed on each segment Length of each segment and traffic signals on the segment are known Signal delay is added to (60/Speed)* Length to estimate the travel time for the segment Travel time on all segments on the route is added to get the trip travel time
12 Alerts via s and Variable Message Signs Users can configure trip, route and segments An upper and lower travel time threshold can be set When trip travel times fall outside the set limits an alert is send to the user Variable Message Signs can be updated to show current travel times Database jobs are scheduled to check for user configured alert threshold periodically
13 Alerts can be scheduled for set time of the day or based on a travel time threshold 15 MINUTES TO 55TH ST 35 MINUTES TO MADISON
14 System Design
15 Segment Level Traffic Condition has Short Term Validity Unlike freeways, arterial travel conditions tend to change frequently Segment speed and travel time estimation is valid for only a shorter time period Travel is not limited to the principal arterials we are monitoring Does not provide a good indication on congested sections of the city
16 Traffic Zone level map for understanding city wide traffic conditions In an urban traffic grid, traffic conditions on major arterials in a particular section of the city is indicative of average traffic conditions in that part of the city Generalized traffic condition in a section of the city is valid for longer periods compared to traffic on individual segments
17 Traffic Zone Level Map Unlike the segment map, Zone map identifies congested sections of the city
18 monday 12 AM monday 03 AM monday 06 AM monday 09 AM monday 12 PM monday 03 PM monday 06 PM monday 09 PM tuesday 12 AM tuesday 03 AM tuesday 06 AM tuesday 09 AM tuesday 12 PM tuesday 03 PM tuesday 06 PM tuesday 09 PM wednesday 12 AM wednesday 03 AM wednesday 06 AM wednesday 09 AM wednesday 12 PM wednesday 03 PM wednesday 06 PM wednesday 09 PM thursday 12 AM thursday 03 AM thursday 06 AM thursday 09 AM thursday 12 PM thursday 03 PM thursday 06 PM thursday 09 PM friday 12 AM friday 03 AM friday 06 AM friday 09 AM friday 12 PM friday 03 PM friday 06 PM friday 09 PM Speed in MPH Downtown (loop) Average Traffic Speed By the Hour of the Day Time of the Day Data from 5/1/2010 to 5/26/2010
19 Additional Data Sources City is currently in discussion with PACE buses, Taxi Cabs, City of Chicago Mobile Asset Tracking System, Airport Express and other possible data providers to supplement data from CTA In the future data from cameras and other detection devices on the streets will be incorporated for more comprehensive coverage
20 Questions? Contact: David Zavattero Deputy Director Chicago Department of Transportation Abraham Emmanuel Principal Systems Programmer Chicago Department of Transportation
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