TIMING TRAFFIC SIGNAL CHANGE INTERVALS BASED ON DRIVER BEHAVIOR

Driver behavior to traffic signal change intervals (yellow plus all-red) was evaluated by using the data collected from timelapse cameras at seven sites. In particular, signal change interval timing was examined as a function of driver response characteristics involving speed, distance, and time to reach the stop line. Driver-selected yellow response time and deceleration rates were analyzed. New perception and brake reaction time of 1.2 sec with a 10.5 ft/sec per sec deceleration rate for level grade is suggested. The potential use of a constant yellow interval of 4.5 sec is discussed. In addition, a new method is presented to determine an all-red interval.