Evaluation of Change Interval Treatments for Traffic Signals at High-SpeedIntersections

摘要

A large number of traffic accidents at signalized intersections on high-speedroadways occur during or just after the change interval. The green extension system (GES) has been used extensively in Kentucky as a method of alleviating the problem related to the dilemma zone. An alternate method of handling this problem involves warning drivers that the signal indication is about to change from green to red using advance warning flashers (AWF). The objectives of the study were: (1) to evaluate the alternative methods (GES or AWF) which can be used to lessen the problem associated with the dilemma zone which occurs at traffic signals, specifically on high-speed roadways and (2) to determine conditions where use of the AWF may be needed.