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Published byOscar Wilkinson Modified over 9 years ago
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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
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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
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Overview 1.Motivation for change 2.Assignment metrics 3.Challenges 4.Status 5.Future plans and applications
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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
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Assignment Metrics -Static Static assignment – Served us well, but – Shortcomings are becoming problematic
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Metrics - Static V/C ratios – PM 2 hr. Can exceed 1.0. Represent average conditions
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Metrics - Static Average speeds – PM 2 hr
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Metrics - Static PM 2-hr volume flows based upon average speeds for time period
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Assignment Metrics - DTA Dynameq (DTA) – Addresses many of the shortcomings
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Metrics - DTA Incremental volumes: 6:30 – 6:35 p.m.
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Metrics - DTA Incremental volumes: 6:35 to 6:40 p.m.
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Metrics - DTA Incremental volumes: 6:40 to 6:45 p.m.
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13 Metrics – DTA Temporal characteristics Static DTA Detector Vehicles per lane per hour
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14 Metrics – DTA Temporal characteristics
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Metrics - DTA Queuing effects – 6:35 to 6:40 pm
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16 Metrics – DTA Time –space diagram
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17 Metrics - DTA Travel time trajectories
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Metrics - DTA Potential for more “realistic” turns at intersections Signal plans Accounts for conflicting moves Visualization/animation Pricing strategies Reliability
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Challenges Building staff expertise Adding network attributes Validation more work Base vs. future year temporal profile Scenario preparation time Computer run time
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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.)
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Status Regional application - DynusT Freeway focus, major highways Consistent with cutline counts o Temporal profile checks Portal data - PSU INRIX o 2035 application
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Status Corridor application – Dynameq Recent purchase – very early stages Subarea has been created with INRO’s assistance Knowledge building o Add signal plans in the heart of the corridor study area. Simpler intersection treatment outside the focal point. o 2035 application o Alternative analysis
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Near Term Applications East Metro Connection Plan – Dynameq corridor study – “test” application SW Corridor Study – Transit study – Lane removals
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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
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Thank you Questions?
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