高速公路 指具有车速高,通过能力大,有四条以上的车道,设中央分隔带,采用立体交叉,全部或局部控制车辆出入,并有设置完善的交通安全设施、管理设施与服务设施等特点,专供汽车高速行驶并以长途直达运输为主的现代化公路,一般年平均昼夜汽车通行量为2.5万辆以上(包括摩托车)。 一级公路 一般能适应年平均昼夜汽车通行量为1万至2.5万辆,连接重要政治、经济中心,通过重点工矿区、 Expressway refers to a vehicle with high speed, high capacity, there are more than four lanes, with the central divider, the use of three-dimensional cross, all or part of the control of vehicle access, and a well-established traffic safety facilities, management facilities and service facilities, Designed for high-speed vehicles and long-distance direct transport to the main modern road, the general average day and night traffic of 25,000 vehicles (including motorcycles). Class 1 roads are generally able to adapt to the annual average day and night traffic of 10,000 to 25,000 vehicles, connecting important political and economic center, through key mining areas,