Dillema Zone Protection and Signal Coordination at Closely-Spaced High-Speed Intersections.

摘要

A high accident potential exists at high-speed signalized intersections where an area close to an intersection, called a dilemma zone (also known as decision zone), often poses a problem to a driver in stopping safely during the yellow interval or in proceeding through the intersection before the beginning of red interval. The driver is exposed to a potentially hazardous situation in which a rear end accident may occur if he stops abruptly during the yellow period or an angle accident if he attempts to cross the intersection at the onset of the red interval. The objectives of this study are to: (a) Assess the feasibility of reducing dilemma zone problems through adjustments of signal timing parameters without sacrificing the benefits of coordination on closely-spaced (100-2000 ft) high speed (greater than or equal to 35 mph) signalized intersections; (b) Develop a new technique that can (I) predict vehicles that would experience dilemma zone and (II) reduce dilemma zone for these vehicles; (c) Simulate the flow of vehicles in a coordinated signal system and implement the new technique by incorporating it in the simulation software; and (d) Recommend a procedure for testing and implementation of the technique in an existing arterial corridor.