本文对高速公路客货混行的主要事故模式,即追尾碰撞、撞固定物及翻车等及其原因进行了分析。追尾事故主要是安全间距不足、客货行车速度差异、货车超载等引起;撞固定物主要是混合干扰、疲劳驾驶等引起;翻车则主要是超车变道、超载等引发。根据这些事故模式及产生的原因,提出了进行车道分界线隆起或颠簸处理、左车道限制、推广使用汽车追尾碰撞预警系统等预防对策。 This paper analyzes the main accident modes of mixed passenger and freight trains on the expressway, namely rear-end collisions, bump fixtures and rollovers, and their causes. Rear-end accidents are mainly caused by lack of safety clearance, differences in the speed of passenger and cargo traffic and overloading of freight cars, etc. The bump fixtures are mainly caused by mixed interference and fatigue driving. The overturning is mainly caused by overtaking and overloading. According to these accident patterns and their causes, some preventive measures such as bulge or bumpy lane boundary line, restriction of left lane and promotion of rear-end collision warning system are proposed.