A microscale traffic simulator for domestic urban areas was developed to study traffic congestion. FHWA's TRAF-NETSIM was selected as the base simulator. First, the applicability of the TRAF-NETSIM to domestic urban traffic was studied. The calculated traffic showed quantitative agreement with the measured one when no vehicles were parked along the roads ; while for the case with parked vehicles. TRAF-NETSIM could not give qualitative agreement because the code does not possess models to represent parked vehicles and their influence. Therefore, the authors developed a new parked-vehicles influence model, which consists of a parked-vehicles model and a passthrough behavior model. In the latter one, according to passable width of the lane left by the parked vehicle, approaching vehicles select one of three pass-through behaviors : "side by side", "break in", or "lane change". The new model was integrated into the TRAF-NETSIM and quantitative improvement was verified for the parked-vehicle case.
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