Abstract
Based on analysis of traffic characteristics of freeway interchange entrance area, Collision Risk Index (CRI) is put forward to evaluate driving risk. Possibility of collision coefficient, speed difference between two colliding vehicles, colliding speed and acceleration of the following car on the target lane are took into consideration in the risk assessment model of CRI. Traffic collisions that may occur in the entrance area are divided into five kinds. The occurrence conditions and risk assessment models of 5 cases are studied correspondingly. Finally, against running speed of main line, distance headway, running speed of vehicle on entrance ramp (front vehicle), three-dimensional numerical simulation has been carried out and driving risk variation laws have been obtained.
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