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在我国,通常把公路分为5个等级,分别是高速公路、一级公路、二级公路、三级公路、四级公路。其中,高速公路是专门为汽车分向、分车道行驶,并全部控制出入的多车道公路,主要用于连接经济、政治、文化上重要的城市和地区,是国家公路干线网中的骨架。一级公路为供汽车分向、分车道行驶,并部分控制出入、部分立体交叉的公路,主要连接重要政治、经济中心,通往重点工矿区,是国家的干线公路。二级公路主要连接政治、经济中心或大工矿区等地的干线公路,或运输繁忙的城郊公路。
In our country, the highway is usually divided into five grades, namely the expressway, the first grade highway, the second grade highway, the third grade highway and the fourth grade highway. Among them, the expressway is a multi-lane road specifically for car-oriented, car-lanes and with full control of access. It is mainly used to connect economically, politically and culturally important cities and regions and is the backbone of the national highway network. A highway for the car points, driving lane, and part of the control of access, part of the three-way intersection of the road, the main important political and economic center, leading to key mining areas, is the country’s trunk highway. The secondary roads connect major arterial roads, such as political and economic centers or large mining areas, or transport heavy suburban highways.