1 / 33

Empirical Analysis of Traffic Sensor Data Surrounding a Bottleneck on a German Autobahn .

Empirical Analysis of Traffic Sensor Data Surrounding a Bottleneck on a German Autobahn. Robert L. Bertini Steven Hansen Portland State University Klaus Bogenberger BMW Group TRB Annual Meeting January 10, 2005. Introduction. Objectives.

conor
Download Presentation

Empirical Analysis of Traffic Sensor Data Surrounding a Bottleneck on a German Autobahn .

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Empirical Analysis of Traffic Sensor Data Surrounding a Bottleneck on a German Autobahn. Robert L. Bertini Steven Hansen Portland State University Klaus Bogenberger BMW Group TRB Annual Meeting January 10, 2005

  2. Introduction.Objectives. • Empirical analysis of features of traffic dynamics and driver behavior on a German autobahn. • Understand details of bottleneck formation and dissipation. • Improved travel time estimation and forecasting: • Traffic management • Traveler information • Driver assistance systems. • Contribute to improved traffic flow models and freeway operational strategies.

  3. Background. • Previous empirical research (U.S., Canada, Germany) • Active bottleneck definition: • Queue upstream • Unrestricted traffic downstream • Temporally and spatially variable, static and dynamic, merges and diverges. • Activation/deactivation times. • Bottleneck outflow features and possible triggers. • Opportunity to compare with previous findings using data from German freeways.

  4. Study Area.Data. • 14-km section of northbound A9, Munich • 17 dual loop detector stations (labeled 280–630) • One-minute counts & average speeds • Cars • Trucks • Six days in June–July 2002 • Focus on June 27, 2002 • Clear weather • Variable speed limits and traffic information (VMS) 630

  5. Methodology.Analysis Tools. • Cumulative curves (Newell, Cassidy & Windover): • Vehicle count • Average speed • Transformations to heighten visual resolution: • Oblique axis • Horizontal shift with vehicle conservation • Retain lowest level of resolution (one-minute) • Identify bottleneck activations and deactivations.

  6. Speeds Northbound A9June 27, 2002 630

  7. Speeds Northbound A9June 27, 2002 1

  8. Bottleneck Activation June 27, 2002Station 380 420 450 390 380off 350 Station 380 + Off Ramp 250 N(x,t)-q0t′,q0=5170 veh/hr 150 50 Time -50 630 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:30 15:35 15:40 15:45 15:50

  9. Bottleneck Activation June 27, 2002Stations 380–390–420 Station 420 + On Ramp Station 390 Station 380 + Off Ramp N(x,t)-q0t′,q0=5170 veh/hr Time 630

  10. Bottleneck Activation June 27, 2002Stations 380–390–420 15:21@ Station 390 15:21@ Station 380 Flow Reduction @380 N(x,t)-q0t′,q0=5170 veh/hr Time 630

  11. 380 70 km/h 15:21 89 km/h V(380,t)-b0t′,b0=3300 km/hr2 Time 15:15 15:20 15:25 15:30 Bottleneck Activation June 27, 2002Station 380 Speed 630

  12. Bottleneck Activation June 27, 2002Stations 380–390–420 15:24@ Station 420 15:21@ Station 390 15:21@ Station 380 380 55600 70 89 15:21 V(380,t)-b0t′,b0=3300 km/hr2 55400 Flow Reduction @380 N(x,t)-q0t′,q0=5170 veh/hr Time 55200 15:15 15:20 15:25 15:30 390 98220 80 41 V(390,t)-b0t′,b0=4335 km/hr2 98170 15:21 98120 Time 15:15 15:20 15:25 15:30 420 95110 65 92 V(420,t)-b0t′,b0=4850 km/hr2 95060 15:24 Time 95010 Time 15:15 15:20 15:25 15:30 630

  13. 540 29800 39 V(540,t)-b0t′,b0=4550 km/hr2 97 29600 15:34 Time 29400 15:15 15:20 15:25 15:30 15:35 15:40 15:45 560 43 83 36620 V(560,t)-b0t′,b0=3550 km/hr2 15:41 36520 Time 36420 15:30 15:35 15:40 15:45 15:50 15:55 16:00 580 34480 43 87 34380 V(580,t)-b0t′,b0=3650 km/hr2 15:42 34280 Time 34180 15:30 15:35 15:40 15:45 15:50 15:55 16:00 600 32700 38 72 32600 V(600,t)-b0t′,b0=3450 km/hr2 15:47 32500 Time 32400 15:30 15:35 15:40 15:45 15:50 15:55 16:00 630 41850 20 93 15:58 V(630,t)-b0t′,b0=3100 km/hr2 41650 Time 41450 15:45 15:50 15:55 16:00 16:05 16:10 16:15 Bottleneck Activation June 27, 2002 630

  14. 540 29800 39 V(540,t)-b0t′,b0=4550 km/hr2 97 29600 15:34 Time 29400 15:15 15:20 15:25 15:30 15:35 15:40 15:45 560 43 83 36620 V(560,t)-b0t′,b0=3550 km/hr2 15:41 36520 Time 36420 15:30 15:35 15:40 15:45 15:50 15:55 16:00 580 34480 43 87 34380 V(580,t)-b0t′,b0=3650 km/hr2 15:42 34280 Time 34180 15:30 15:35 15:40 15:45 15:50 15:55 16:00 600 32700 38 72 32600 V(600,t)-b0t′,b0=3450 km/hr2 15:47 32500 Time 32400 15:30 15:35 15:40 15:45 15:50 15:55 16:00 630 41850 20 93 15:58 V(630,t)-b0t′,b0=3100 km/hr2 41650 Time 41450 15:45 15:50 15:55 16:00 16:05 16:10 16:15 Bottleneck Activation June 27, 2002 1 15:21 15:24 15:34 15:41 15:42 15:47 15:58 630

  15. Bottleneck Activation June 27, 2002Stations 320–340–350–380 N(x,t)-q0t′,q0=5170 veh/hr Station 380 + On-Ramp Station 350 Station 340 Station 320 + Off-Ramp Time 630 Time @ station 380

  16. Bottleneck Activation June 27, 2002Stations 320–340–350–380 N(x,t)-q0t′,q0=5170 veh/hr 15:21@ Station 380 Flow Reduction @380 Time 630 Time @ station 380

  17. 320 104 15:27 19790 105 V(320,t)-b0t′,b0=6000 km/hr2 19740 Time 19690 15:15 15:20 15:25 15:30 15:35 15:40 15:45 340 15:26 97 22420 V(340,t)-b0t′,b0=5600 km/hr2 99 22370 Time 22320 15:15 15:20 15:25 15:30 15:35 15:40 15:45 350 15:23 84 40700 84 V(350,t)-b0t′,b0=4200 km/hr2 40600 40500 Time 15:15 15:20 15:25 15:30 Bottleneck Activation June 27, 2002Stations 320–340–350–380 N(x,t)-q0t′,q0=5170 veh/hr 15:21@ Station 380 15:23@ Station 350 Flow Reduction @380 15:27@ Station 320 15:26@ Station 340 Time 630 Time @ station 380

  18. Bottleneck Activation June 27, 2002 • Active bottleneck located between detectors 380 and 390. • Activated at 15:21. • Queue propagated as far as detector 630. • Unrestricted traffic downstream. 630

  19. Bottleneck ActivationJune 27, 2002 17:28 1 17:35 19:40 15:21 17:38 18:44 19:18 15:24 17:40 15:34 15:41 15:42 15:47 15:58 630 Direction of Travel

  20. Bottleneck ActivationJune 27, 2002 2 17:28 1 17:35 19:40 15:21 17:38 18:44 19:18 15:24 17:40 15:34 15:41 15:42 15:47 15:58 630 Direction of Travel

  21. Bottleneck ActivationJune 27, 2002 2 17:28 1 17:35 3 19:40 15:21 17:38 18:44 19:18 15:24 17:40 15:34 15:41 15:42 15:47 15:58 630 Direction of Travel

  22. Bottleneck ActivationJune 27, 2002 2 17:28 4 1 17:35 3 19:40 15:21 17:38 18:44 19:18 15:24 17:40 15:34 15:41 15:42 15:47 15:58 630 Direction of Travel

  23. Bottleneck Activation June 27, 2002Stations 380–390–420 N(x,t)-q0t, q0=5178 veh/hr N(420,t) N(390,t) 100 N(380,t) 0 Time 15:00 16:00 17:00 18:00 19:00 630

  24. Bottleneck Activation June 27, 2002 1 N(x,t)-q0t, q0=5178 veh/hr N(420,t) N(390,t) 100 N(380,t) 0 18:45 19:18 17:35 17:40 15:21 Time 15:00 16:00 17:00 18:00 19:00 630

  25. Bottleneck Activation June 27, 2002 1 N(x,t)-q0t, q0=5178 veh/hr 100 N(380,t) 0 18:45 19:18 17:35 17:40 15:21 Time 15:00 16:00 17:00 18:00 19:00 630

  26. Bottleneck Activation June 27, 2002 1 5370 vph N(x,t)-q0t, q0=5178 veh/hr 100 N(380,t) 0 18:45 19:18 17:35 17:40 15:21 5510 vph Time 15:00 16:00 17:00 18:00 19:00 630

  27. Bottleneck Activation June 27, 2002 4 1 5370 vph N(x,t)-q0t, q0=5178 veh/hr 100 N(380,t) 0 18:45 19:18 17:35 17:40 15:21 5510 vph 5410 vph Time 15:00 16:00 17:00 18:00 19:00 630

  28. Bottleneck Activation Northbound A9Outflow Summary at 380 630

  29. Bottleneck Activation Northbound A9On-Ramp DynamicsJune 27, 2002 Station 420 600 15:21 @390 500 2630 t' 15:20 400 0 2330 15:16 1850 300 N(420 on ramp,t) - q 2660 (+12%) 2370 1830 200 2630 100 2280 veh/hour Time 0 14:30 14:45 15:00 15:15 15:30 15:45 16:00 630

  30. Bottleneck Activation Northbound A9Station 420 Truck Flow Dynamics June 27, 2002 Ramp Right q0=385 veh/hour 15:21 @390 Trucks Only 510 330 490 260 750 (+190%) 530 Mainline Right q0=220 veh/hour N(x,t)-q0t 320 230 580 Ramp Left q0=15 veh/hour 160 50 550 320 350 (+120%) 330 240 400 veh/hour 170 100 390 50 40 24 230 30 Mainline Left q0=22 veh/hour 20 630 270 (9 trucks in 2 minutes)

  31. Bottleneck 1 Activation Northbound A9Station 390 Truck Flow Dynamics June 27, 2002 Shoulder q0=560 veh/hour 15:21 @390 Trucks Only 740 570 420 820 (+95%) 770 Center q0=65 veh/hour 180 670 80 470 140 740 N(x,t)-q0t 400 630 veh/hour 100 210 (+120%) 210 80 20 30 Median q0=15 veh/hour 200 220 70 20 70 180 (6 trucks in 2 minutes, +680%) 20 630

  32. Conclusion. • Method for diagnosing active bottlenecks. • 11 bottleneck activations on 6 days at one location. • Measured bottleneck outflows appear stable: • Day to day (contrary to other research) • Preceded by queueing or not • Pre-queue flows measurably higher than bottleneck outflow. • Precursors to queue formation some distance downstream of merge: • Rise in on-ramp flow (total) • Surges in truck counts • Research continuing at this and other sites in Germany.

  33. Thank you for your attention. AcknowledgementsBMW GroupOregon Engineering Technology Industry CouncilPortland State UniversitySteven Boice

More Related