Freeway Micro-simulation Calibration: Case Study Using Aimsun and VISSIM with Detailed Field Data

摘要

A microscopic simulation model is needed to support the development of Variable SpeedLimit/Advisory (VSL/VSA) and Speed Harmonization algorithms. The prospective algorithmswill be field implemented and tested so the model needs to match the real traffic conditions wellbefore the algorithm can be developed. Detailed field data were collected at key locations alongthe freeway mainline and onramps and off-ramps for over a week, including flow, speed andoccupancy. The compatibility of the data at all locations has been cross-checked by flowconservation, which is accurate enough for system modeling. Simulation models have been builtin both Aimsun and VISSIM and quantitatively calibrated. Both flow and speed should bematched at critical locations. The calibration criteria for flow include GEH Flow calibrationcriteria, Relative Root Mean Square Error (RRMSE), and accumulated flow; and for speed theFundamental diagram is used. Simulation results are presented, showing that the two modelsmatch the field data at critical locations reasonably well.