Analyzes on Route Choice Behavior of Car Drivers and Modeling for Traffic Assignment

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1.The purpose and contents of the studyIn this study, in order to improve the precision of traffic assignment, based on a survey of car drivers' actual travel behavior, we firstly analyze the influencing factors of route choice behavior and departuretime decisions. Then, we develop a route choice model and examine the applicability of it to the real road network assignment. Secondly, based on the idea that it is necessary to develop a model incorporating the within-day dynamics and day-to-day dynamics in traffic conditions, after the presentation of a basic model we examine the real states of the dynamics in traffic conditions by using traffic surveys on several days.2.The results of the studyThe results of the study are as follows :(1) In addition to the travel-time-related factors which have been used in the traditional traffic assignment, factors such as truck volumes and driving views can not be ignored.(2) The value of the safety margin which influences on the departure-time of travel reflects the magnitude of the loss of the delay in designated arrival time, and it is dependent on factors such as the trip purpose and traveler's characteristics.(3) The goodness of fit of the traffic assignment model incorporating the probit-based stochastic route choice model is better than that of the deteministic equilibrium model, but is a little worse than that of logit-based stochastic model.(4) The existence of the day-to-day variation in traffic conditions is confirmed by analyzing the data of surveys on several days.