Simulation of a Large Freeway/Arterial Network with CORSIM, INTEGRATION and WATSim

Simulation of a large integrated (street/freeway) network with three state-of-the art software is presented. The 20 centerline km network includes three on-ramps, three off-ramps, an on/off-ramp weaving section, and a high design arterial with nine signalized intersections. All three software were able to replicate field measured volumes well, after considerable modifications to default settings. INTEGRATION required extensive modifications to approximate complex signal timing plans and had problems with lane alignment on the wide arterial. CORSIM's FRESIM component had a problem with vehicles that miss their destination and required car-following parameter settings corresponding to unusually high capacities to produce good results. WATSim needed the fewest modifications and it was primarily sensitive to merging/acceleration lengths. WATSim and CORSIM speeds were close to each other. INTEGRATION's simplified treatment of signalization produced higher street link speeds.

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