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Pseudo Dynamic Traffic Assignment

Pseudo Dynamic Traffic Assignment. A Duration Based Static Assignment Process. Planning Context: I-285 Strategic Implementation Plan. ARC Regional Travel Demand Model. 24-Hour Volumes Static Assignment Process 13 County Region SOV, HOV, Trucks and Transit. Big Leap from Macro to Micro.

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Pseudo Dynamic Traffic Assignment

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  1. Pseudo Dynamic Traffic Assignment A Duration Based Static Assignment Process

  2. Planning Context: I-285 Strategic Implementation Plan ARC Regional Travel Demand Model • 24-Hour Volumes • Static Assignment Process • 13 County Region • SOV, HOV, Trucks and Transit

  3. Big Leap from Macro to Micro ARC Regional Travel Demand Model 1. Temporal distribution of traffic 2. Better peak period paths • 24-Hour Volumes • Static Assignment Process • 13 County Region • SOV, HOV, Trucks and Transit Microscopic Model VISSIM • 15-Min. Volumes • I-285 Corridor • Traffic Control • ITS Strategies • SOV, HOV and Trucks • Dynamic Traffic Assignment

  4. Overall Modeling Process ARC Regional Travel Demand Model 1. Temporal distribution of traffic 2. Better peak period paths Matrix Variegator • 24-Hour Volumes • Static Assignment Process • 13 County Region • SOV, HOV, Trucks and Transit Mesoscopic Model DTA • 15-Min. Volumes • 13 County Region • SOV, HOV and Trucks • Static Assignment Process • 15-Min. Volumes • 13 County Region • Traffic Control • ITS Strategies • SOV, HOV and Trucks • Dynamic Traffic Assignment Microscopic Model VISSIM • 15-Min. Volumes • I-285 Corridor • Traffic Control • ITS Strategies • SOV, HOV and Trucks • Dynamic Traffic Assignment

  5. Planned Mesoscopic Approach • VISTA • Northwestern University • Only DTA program reported to be able to handle the problem size at the time • Issues encountered: • Data assumptions • Data preparation • Software bugs • Memory intensive • Excessive runtimes • “Plan B” required

  6. Plan B – Options Considered • Successive Static Assignments • Write custom applications to track long trips • Use a different DTA package • Cube Avenue, Dynameq, DynaSMART-P, etc. • Discovered an option in Citilabs software already in the assignment pathload function that enables volumes to be saved in travel time segments

  7. Pathload Option pathload path=TIME, vol[1]=mw[1], time=0-15, vol[10]=mw[1], time=15-30, vol[11]=mw[1], time=30-45, vol[12]=mw[1], time=45-60, vol[13]=mw[1], time=60-75, vol[14]=mw[1], time=75-99999

  8. 60-75 minutes Preload assignment 5 45-60 minutes Preload assignment 4 30-45 minutes Preload assignment 3 15-30 minutes Preload assignment 2 0-15 minutes Pseudo DTA Overview 75 minute trip

  9. Pseudo DTA – Preload Management

  10. Time=0 min Direction of Travel 5 miles 60 miles 000 Total Volume (15-minute) 000 Preload Volume (15-minute) Two-Zone Examples • 60-mile single-lane corridor • Assume capacity of 2000 vph • Assume free-flow speed of 60 mph • Link sub-divided into 5-mile segments in order to see the progression of volume during the PDTA process

  11. Time=15 min Time=120 min Time=60 min Time=105 min Time=0 min Time=30 min Time=90 min Time=75 min Time=45 min Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) Two-Zone Examples Free-Flow Traffic Conditions (1000 vph)

  12. Time=60 min Time=120 min Time=105 min Time=0 min Time=90 min Time=75 min Time=15 min Time=135 min Time=45 min Time=30 min Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) Two-Zone Examples Congested Traffic Conditions (2000 vph)

  13. Time=105 min Time=150 min Time=75 min Time=135 min Time=0 min Time=45 min Time=120 min Time=90 min Time=15 min Time=60 min Time=30 min Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel Direction of Travel 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 5 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 60 miles 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) 000 Total Volume (15-minute) 000 Preload Volume (15-minute) Two-Zone Examples Over-Saturated Traffic Conditions (3000 vph)

  14. I-285 Application

  15. Pseudo DTA - Validation

  16. Potential Applications • Refined time-of-day assignments • Evacuation Modeling • Special Events Arrival & Departure • Lane Closures

  17. Questions / Comments

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