A traffic signal control method called Dilemma-Free has been introduced for more than fifteen years. In this method, there is an important issue about driver/vehicle behaviors involving the reaction time of a driver for braking and the deceleration rate of a vehicle. This paper describes a study of the stopping behavior of drivers in the dilemma zone using a driving simulator, and a questionnaire survey to inquire test drivers about their decision whether to cross or stop at the intersections. Results of this study show that there is no clear difference in approach speeds between stopped and passing vehicles and the drivers' decision in the dilemma zone is heavily influenced by the vehicle's distance to the stop line. Additionally, questionnaire survey confirmed that the status of pedestrian signals is one of the primary factors influencing drivers' decisions.
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