ABSTRACT
The safety of intersections directly influences the traffic situation of the whole city. To improve intersection safety, this paper presents an evaluation method of urban intersection safety based on Traffic Conflict Technique (TCT) under mixed traffic involving vehicle, bicycle and pedestrian. The intersection risk degree is used as evaluation index, and the traffic conflict risk degree is calculated by using factors of Time-To-Collision(TTC), conflict speed and conflict angle. The conflict risk degrees include vehicle-vehicle conflict risk degree, vehicle-bicycle conflict risk degree and vehicle- pedestrian conflict risk degree. Then, the evaluation model of urban intersection safety is presented. Based on the model, the evaluation method is proposed using analysis of Vissim and SSAM (Surrogate Safety Assessment Model) Finally, series observation experiments are conducted to obtain the parameters of two urban intersections. The evaluation method is proved to be effective by the simulation.
