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Dynamic Traffic Assignment:

Dynamic Traffic Assignment:. Integrating Dynameq into Long Range Planning Studies. Model City 2011 – Portland, Oregon Richard Walker - Portland Metro Scott Higgins, Peter Bosa – Portland Metro. Introduction. Current DTA Applications

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Dynamic Traffic Assignment:

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  1. Dynamic Traffic Assignment: Integrating Dynameq into Long Range Planning Studies Model City 2011 – Portland, Oregon Richard Walker - Portland Metro Scott Higgins, Peter Bosa – Portland Metro

  2. Introduction Current DTA Applications • Immediate project impacts (e.g., lane closures, ramp openings, construction impacts, etc.) • Short term horizon DTA as a planning tool • Alternative analysis (multiple scenarios, comparative evaluation metrics) • Long term horizon

  3. Overview Motivation for change Assignment metrics Challenges Status Future plans and applications

  4. Motivation for Change • Congestion is a given. Assignment tools need to operate within that environment. • Decision metrics are changing • Queuing and path choice effects • Duration of congestion • Temporal characteristics matter

  5. Assignment Metrics -Static • Static assignment • Served us well, but • Shortcomings are becoming problematic

  6. Metrics - Static V/C ratios – PM 2 hr. Can exceed 1.0. Represent average conditions

  7. Metrics - Static Average speeds – PM 2 hr

  8. Metrics - Static PM 2-hr volume flows based upon average speeds for time period

  9. Assignment Metrics - DTA • Dynameq (DTA) • Addresses many of the shortcomings

  10. Metrics - DTA Incremental volumes: 6:30 – 6:35 p.m.

  11. Metrics - DTA Incremental volumes: 6:35 to 6:40 p.m.

  12. Metrics - DTA Incremental volumes: 6:40 to 6:45 p.m.

  13. Metrics – DTATemporal characteristics Vehicles per lane per hour Detector DTA Static

  14. Metrics – DTATemporal characteristics

  15. Metrics - DTA Queuing effects – 6:35 to 6:40 pm

  16. Metrics – DTATime –space diagram

  17. Metrics - DTATravel time trajectories

  18. Metrics - DTA • Potential for more “realistic” turns at intersections • Signal plans • Accounts for conflicting moves • Visualization/animation • Pricing strategies • Reliability

  19. Challenges Building staff expertise Adding network attributes Validation more work Base vs. future year temporal profile Scenario preparation time Computer run time

  20. Status Staff development • Read (DTA Primer) • Observe other studies • Develop expertise with other DTA software. (Note: We have recently added Dynameq capability). • Dynameq – tutorial and formal training Network development • Geometries • Attributes (signal locations, lanes/turn bays, etc.)

  21. Status Regional application - DynusT • Freeway focus, major highways • Consistent with cutline counts • Temporal profile checks Portal data - PSU INRIX • 2035 application

  22. Status Corridor application – Dynameq • Recent purchase – very early stages • Subarea has been created with INRO’s assistance • Knowledge building • Add signal plans in the heart of the corridor study area. Simpler intersection treatment outside the focal point. • 2035 application • Alternative analysis

  23. Near Term Applications East Metro Connection Plan • Dynameq corridor study • “test” application SW Corridor Study • Transit study • Lane removals

  24. Future Plans • Elevate DTA to “everyday tool” status • Use DTA to provide better input to microsimulation • Link to MOVES • Investigate transit treatment in DTA • Link to tour based model • “DASH” model very temporally based

  25. Thank you Questions?

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