摘要：AbstractDilemma zone at signalized intersection has been recognized as a major potential factor causing rear-end and right-angle crashes. However, the impacts of dilemma zone have seldom been considered in optimization procedures of signal coordination. This paper conducts a comprehensive evaluation of effects of optimization objectives for signal coordination at two coordinated signalized intersections. Microscopic traffic simulation software, VISSIM, was used to represent the stochastic variation of traffic flow. The results indicate that the traffic flow fluctuation, the optimization objectives, and traffic demand level have significant impacts on dilemma zone distribution. Compared with length of dilemma zone, the number of vehicles in dilemma zone is more sensitive to the signal coordination. The method to avoid dilemma zone is also proposed based on simulation results.
