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Published byAngela Nicholson Modified over 9 years ago
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DVRPC TMIP Peer Review Dynamic Traffic Assignment (DTA) Oct. 29 th, 2014
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Why we used/need DTA Used DTA for special applications: Center City evacuation modeling I-95 reconstruction analysis Center City bridges reconstruction analysis Other use cases Always some construction projects in the region Evaluate time-of-day tolling and other CMP strategies Make full use of ABM (SHRP2 C10)
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Center City Simulation Models Model Area: 2x1 miles, 300+ signals 260,000+ jobs Multi-tier model design Multi-mode simulations Used for modeling two emergency scenarios Extended for bridge reconstruction analysis (ongoing project)
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Intersection Modeling
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Dynamic Traffic Assignment VISUM DUE - macroscopic DTA Use temporal profile (dynamic loading) approach Use flow-density diagram Model queue spillback Accept time-varying attributes Extended for pedestrian simulations
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Multi-Mode Simulation
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Example Outputs of DTA Bus Delay Auto Volume
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Wishlist Better intersection modeling Better spill-back handling Dynamic OD estimation capability Modeling ITS strategies (e.g. VMS) Simulation-based DTA More accurate ? Feasible (regional implementation) ?
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I-95 Reconstruction Analysis I-95 corridor 52-mile long,170,00 ADT Analysis needs Interchange reconfiguration alternatives analysis Construction closure alternatives screening Reconstruction plans and staging
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I-95 Dynus-T Model Model Spec TIM 1.0 model area, 50,000 links, 2,000 zones 24-hour demand in 15-minute Intervals Pros Individual vehicles represented Queue lengths are explicitly modeled Routes updated during trip in response to encountered congestion Better representation of signals and intersection operations
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Regional DTALite Model
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Model Spec TIM 2.0 model area, 256,000 links 4-hour AM period (5-million vehicles) Pros Use data hub (ease data transferability) Modeling flexibility (Simplicity ->Complexity) Simple point queue-> spatial queue -> kinematic wave model Simple signal representation -> HCM type critical movement based signal timing optimization
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DTA in TIM 3.0 ? Model type Analytical based Simulation based Where to use (in conjunction with ABM) Highway assignment only Highway skimming and assignment Other issues Model transfer / network synchronize Run time Calibration
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