Operating Left-Turn Phase at Signalized Intersection Based on Traffic Conflict Technique

Assuming that the frequency of various types of conflicts occurring at intersections follows a Poisson distribution, this paper first introduces the method of identifying dangerous conflicts and then analyzes traffic conflicts at two phasing intersections by using a traffic conflict technique. In this paper, a two-phase signalized intersection is selected as the survey site and the method of identifying dangerous conflicts is applied to diagnose various types of conflicts at the intersection. By operating a protected left-turn phase at the approach which is diagnosed as causing existing dangerous conflicts, fewer conflicts occur at this intersection. Meanwhile, VISSIM verifies that operation efficiency of vehicles at the intersection has been improved. Therefore, the conflict technique can be used to select signal phasing effectively.