在世界各国的交通运输中,公路运输占着相当重要的地位。高速公路以其较高的运输能力和一定的经济效益及军事意义,作为现代化的一个标志,发展极为迅速。目前,世界大多数国家都在修建高速公路。近几年来,我国现代化高速公路建设方兴未艾,有些地方的高速公路已经建成使用;有些高速公路正在建设中。实践证明,高 Road transport occupies a very important position in the transport of all countries in the world. With its high transport capacity and certain economic benefits and military significance, the expressway is developing rapidly as a sign of modernization. At present, most countries in the world are constructing highways. In recent years, the construction of our country’s modern expressway is in the ascendant. In some places the expressway has been built and used; some highways are under construction. Practice has proved that high