Abstract: In order to study the impacts of different factors on injury to the rider in a collision accident between automobile-motorcycle, based on a real case in the National Vehicle Accident Investigation System (NAIS), a model was built for collision between the front of the car and the right side of the motorcycle by using the PC-Crash software. Based on this basis, the influencing factors were identified and orthogonal experiments involving the car, the motorcycle, and the motorcycle rider were designed and carried out. The weights of them were analyzed. The influences of significant factors on the process were explored. Research shows that the car speed, rider's sitting high and hood front edge height from the ground are significant factors, that the smaller the rider's sitting high, the shorter the moment for the rider collision with the automobile, the injury to the rider, and that the greater hood front edge height from the ground, the smaller the injury to the rider.

Key words: rider injuries, collision accident, orthogonal experiment, motorcycle, rider's sitting high