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Vehicle load is one of the most important variable loads in both load carrying capacity assessment and reliability evaluation.The study of actual vehicle will be helpful for overload control because of actual vehicle load messages.In this paper,based on the weight in motion (WIM) system,a 810 meters long rigid-frame bridge with spans arrangement of 145 + 260 + 260 + 145 m in the national highway G 15 was taken as the background,and the actual vehicle load model was studied.