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20世纪50年代后,随着一些发达国家相继大量修筑以全封闭、全立交、双向分离为主要特征的高速公路,公路运输在国民经济和各种运输方式中的地位和作用日益突出和重要。高速公路的主要优点是快速、安全、经济,在整个路网中起主动脉和大通道的作用。随着各国经济实力的增强和技术的进步,交通运输量大幅度增加,汽车日益大型化和高速化,国外高速公
Since the 1950s, as a few developed countries have built a large number of expressways with closed, full interchange and two-way separation as the main features, the status and role of road transport in the national economy and various modes of transportation have become increasingly prominent and important. The main advantages of freeways are fast, safe and economical, functioning as the aorta and large channel throughout the road network. With the enhancement of economic strength and technological advancement of various countries, the volume of transportation has increased substantially, the vehicles have been increasingly large-scale and high-speed, and foreign highways