Abstract
The driver's decision making is a typical decision making under uncertainty. A number of cognitive science studies of decision making under uncertainty have indicated that decision making is critically affected by the decision frame, that is, subjective interpretation of the decision problem. It has also been pointed out that the uncertainty of outcome is perceived as an interval of possible resultant values. Based on these findings, we propose a model of driver's departure time decision. The properties of departure time decision found based on empirical data in this study confirm the hypotheses of the model, while have not so far been depicted by models based on expected utility theory.