Abstract:

To improve the precision of traffic conflict discrimination, a comprehensive traffic conflict discrimination model was established using the traffic conflict theory, the relative movement theory and Fisher discrimination principle and taking the speed, distance and angle as key variables. The traffic conflict discrimination was devided into two phases: the occuring phase of traffic conflict and the discriminating phase of traffic conflict severity. The traffic conflicts were analyzed qualitatively and quantitatively, the causes of the traffic conflict and the movement patterns of the conflicting objects were studied to build a critical conflict region. A model to discriminate the severity of traffic conflict was built using the Fisher discrimination principle. Thus a complete traffic conflict discrimination model was achieved. This model can be applied to predict and judge the conflict between any two of motor vehicles, nonmotor vehicles, and pedestrians, providing a theoretical basis for automatic recognition technique of traffic conflicts.

Key words: engineering of communication and transportation safety, traffic conflict discrimination, vector geometry principle, critical conflict region, Fisher discrimination principle