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Whenever a traffic accident occurs, the police will first arrive at the scene and lock down the area. Once it is done, the police will draw the accident spot map, take down accident related testimony and photograph the damage for future reference. Furthermore, the police will inspect the skid marks, the collision point, the initial position and estimate pavement friction coefficient based on the weather. All these data will be used to calculate the initial condition of the vehicle in the traffic accidents. This study is to understand the theory of automobile collision and accident simulation software PC-Crash, then use the software calculate and compare the results with actual cases. If there should be differences, vehicle parameters such as vehicle pre-collision speed, pavement friction coefficient, vehicle center of gravity, collision geometric path, vehicle weight, will be adjusted. The process is to study the impact of vehicle parameters. Key words:Accident Simulation Software PC-Crash
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