01126668

Component

High-speed isolated intersections are typically operated in an actuated mode, using advance detectors on the major approaches and stop bar detectors on minor approaches/phases. The advance detectors on the major approaches constitute green extension systems (GES), where the green phase is extended due to the detector locations and extension times until all the vehicles in the dilemma zone are cleared. In this context, dilemma zone is defined in distance or time as the area upstream of stop bar where drivers are indecisive whether to stop or go at the onset of yellow, and is considered as a leading cause for crashes at high-speed signalized intersections. This paper presents a new optimal GES design, developed using a multi-objective genetic algorithm optimization algorithm. The new design improves both safety performance and control delay. A new traffic-conflict-based safety measure, called the dilemma hazard, is used to evaluate the safety performance. Monte Carlo simulation results show that the new design provides better dilemma zone protection while maintaining a low control delay level.

01120148

09-3305

English

15P

2009

Transportation Research Board 88th Annual Meeting

DVD

Figures (12) ; References (24)

Genetic algorithms; Green interval (Traffic signal cycle); Monte Carlo method; Operations; Optimization; Signalized intersections; Traffic actuated controllers; Traffic delays; Traffic safety; Traffic simulation

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

Transportation Research Board Annual Meeting 2009 Paper #09-3305

TRIS, TRB

Jan 30 2009 7:43PM