The purpose of this study was to determine the effectiveness of green-extension systems (GES) for reducing the dilemma-zone problem associated with the amber phase of traffic signals at high-speed intersections. Reactions of 2,100 drivers were noted during the amber phase at nine Intersections, and the dilemma-zone distances with respect to the stop bar were determined.
Digital Object Identifier
Zegeer, Charles V. and Deen, Robert C., "Green-Extension Systems at High-Speed Intersections [Apr. 1978]" (1978). Kentucky Transportation Center Research Report. 834.