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Dynamic Traffic Assignment:Integrating Dynameq into Long Range Planning Studies
Model City 2011 – Portland, Oregon
Richard Walker - Portland MetroScott Higgins, Peter Bosa – Portland Metro
Introduction
Current DTA Applications• Immediate project impacts (e.g., lane
closures, ramp openings, construction impacts, etc.)
• Short term horizonDTA as a planning tool• Alternative analysis (multiple scenarios,
comparative evaluation metrics)• Long term horizon
Overview
1. Motivation for change2. Assignment metrics3. Challenges4. Status5. Future plans and applications
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
Assignment Metrics -Static• Static assignment– Served us well, but– Shortcomings are becoming
problematic
Metrics - DTA• Potential for more “realistic” turns at
intersections• Signal plans• Accounts for conflicting moves
• Visualization/animation• Pricing strategies• Reliability
Challenges
• Building staff expertise• Adding network attributes•Validation more work• Base vs. future year temporal profile• Scenario preparation time• Computer run time
Status
Staff developmentRead (DTA Primer)Observe other studiesDevelop expertise with other DTA
software. (Note: We have recently added Dynameq capability).
Dynameq – tutorial and formal trainingNetwork development
Geometries Attributes (signal locations, lanes/turn
bays, etc.)
Status
Regional application - DynusTFreeway focus, major highwaysConsistent with cutline countso Temporal profile checks
Portal data - PSUINRIX
o 2035 application
Status
Corridor application – DynameqRecent purchase – very early stagesSubarea has been created with INRO’s
assistanceKnowledge buildingo Add signal plans in the heart of the
corridor study area. Simpler intersection treatment outside the focal point.
o 2035 applicationo Alternative analysis
Near Term Applications
East Metro Connection Plan– Dynameq corridor study– “test” application
SW Corridor Study– Transit study– Lane removals
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