An International Comparative Study on Driver Risk Exposure during Intergreen Intervals at Signalized Intersections

Abstract

This paper presents an international comparative study on driver risk exposure during intergreen intervals at signalized intersections in Japan and the United States. Severity of traffic conflicts as well as the interaction between the last clearing vehicle and the first entering vehicle at the change of phases was empirically analyzed and compared. Furthermore, a new method of determining the optimal all-red time was proposed by incorporating interaction time that accounts for the effect of the clearing vehicle on entering time of the first entry vehicle when a clearance failure occurs.