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Published byRaymond Simon Modified over 9 years ago
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Forecasting/Simulation Interface on I-694 Reconstruction from I-35E to I-35W Mn/DOT Travel Demand Modeling Coordinating Committee December 12, 2005 Meeting Jaimie Sloboden
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I-694 Reconstruction from I-35E to I-35W Widen I-694 from 4-lanes to 6-lanes Modification/reconstruction of 5 interchanges –I-35W –TH 10/Snelling/Hamline –Lexington –Victoria St –Rice Street Completes Un-weave the weave I-35W not part of the “plan”
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Project Limits
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MN/DOT’s Freeway Simulation Process CORSIM is the Current Simulation Program (being reviewed by Eil Kwon and U of M) Field Observations Base Model Development Error Checking Model Calibration –Driver Behavior Alternatives Analysis Final Report
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Simulation Limits (physical)
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Simulation Limits (Temporal) Duration of Congestion in Metro Area is 3 to 5 hours per peak period 1 hour simulation models in metro inadequate (Lake St Access Case Study proved this) 15 minute data
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Simulation Limits vs. Project Limits Extended Boundary Limits required to “Feed” Traffic into Project Area Analysis of non-project elements “required” Non-project elements in simulation model may or may not be part of TSP, TIP, STIP, TPP Non-project elements may create a bottleneck impacting the analysis
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Forecasting Process Mn/DOT Metro Guidelines Reviewed and updated Land Use Reviewed and updated Network Attributes Screen line Evaluation Post Processing applied –Base error applied to Future error Reasonableness Checks
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Regional Model Network
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Forecast Product Peak Hour & Daily
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Converting Forecasts to Simulation Inputs Single Peak Hour (forecast) converted to 3-hour 15 minute data (simulation) – 694 model had 15,000 traffic volume inputs Big Math Problem! Two Approaches –Option 1: factor existing 15 minute data by peak hour ratio –Option 2: Forecast 15-minute data o-d (Crosstown model) Option 1 used for I-694
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Sample Calculations Existing 15-minute pattern duplicated There are challenges with this process
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Origin-Destination Data
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Partial 15 minute Volume Data Base for Freeways
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System Origin-Destination Data
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Conclusions Better interaction required between Forecasting and Simulation processes –Preparing 15-minute forecasts for simulations problematic Forecasting process needs to catch up with Simulation –Qa/QC –Network coding errors –Systematic approach Simulation exposes many issues with the “Plan”, dealing with these new issues
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