在世界汽车总的保有量中，商用汽车所占比例不超过20％，但是它们却承担了世界上75％的货物运输和相当一部分的公路旅客运输任务。因此，商用汽车的行驶安全既关系到世界货流的通畅和经济效益，又关系到旅客的生命和财产安全，倍受各国政府和汽车生产企业的关注。近年来，一方 Commercial vehicles account for no more than 20% of the total car ownership in the world, but they account for 75% of the world’s freight traffic and a considerable portion of road passenger traffic. Therefore, the driving safety of commercial vehicles not only affects the smoothness and economic benefits of the world’s goods flow, but also relates to the lives of passengers and property safety, much of the concern of governments and automobile manufacturers. In recent years, one side