高速公路的不断沿伸,对于促进社会经济与文明的发展起到了重大的推动作用。管理好高速公路,保证交通安全,避免交通事故发生,是高速公路管理部门的一项重要职能。与普通公路一样影响高速公路交通安全的主要因素也是人、车和环境三方面。高速公路基本上都是全线封闭,排除了横向干扰,且路面平整开阔,无 The continuous extension of expressways has played a significant role in promoting social, economic and civilizational development. It is an important function of expressway management department to manage expressways, ensure traffic safety and avoid traffic accidents. As with the ordinary highway traffic safety impact of the main factors are people, vehicles and the environment in three areas. The expressways are basically closed on all fronts, excluding horizontal disturbances and smooth and open pavements.