Calibration and Adjustment of System Planning Models
This manual describes quick and simple procedures for calibrating and adjusting systemwide transportation models so they replicate existing ground counts and can be used in forecasting. It includes a troubleshooting section that describes various problems and gives possible solutions. The contents are as follows: (1) Introduction; (2) Networks; (3) Trip Generation; (4) Auto Occupancy; (5) Trip Distribution; (6) Traffic Assignment; (7) Transit Ridership Effects on Highway Volumes; (8) External Stations; (9) System Changes Versus Local Changes; (10) Expected and Required Accuracy; (11) Conclusions; and (12) Troubleshooting.
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all-or-nothing assignment arterial assigned volumes assignment algorithm auto occupancy rates average trip lengths calibration and validation capacity restraint assignment central business district centroid connectors cutlines Decrease distribution parameter dwelling units E-E trips equilibrium assignment example exponential function external stations external trips Federal Highway Administration forecasted volumes forecasting package free travel freeway friction factor table functional classification gravity model Home-Based increase intersection penalties interzonal intrazonal trips iterations left turn link speeds link volumes manual miles per hour minutes model calibration model parameters modeling process Modify number of dwelling number of lanes number of trips person trips problem procedure productions and attractions shown in Figure skim tree socioeconomic data specific link speed and capacity speed or capacity total number traffic assignment traffic counts transit ridership trip generation rates trip production trip purposes trip rates trip table trips going trips per dwelling turn penalties vehicle trips VMT per person