To improve the active safety of vehicles, not only the stability of vehicles but the analysis of driver's behavior in case of emergency such as accidents is important. The purpose of this study is to construct a driver's behavior model in order to predict by computer simulation the performance of a man-vehicle system in case of the emergency. First, the fundamental model was constructed in ordinary situations such as lane change maneuver. The characteristics of the model was that the parameters were possible to adjust systematically without trial and error. Second, the characteristics of the driver's behavior were derived from the results of the experiment using a driving simulator which reproduced an obstacle avoidance situation and a curve situation changing the road surface friction. Based on the characteristics of the driver's behavior and the fundamental model, a driver model in emergent situations was constructed.
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