道路,是供各种车辆和行人等通行的工程设施。在我国,道路有国道、省道、县道和乡道之分。国道是在国家公路网中,具有全国性的政治、经济、国防意义,并经确定为国家级干线的公路。目前,我国共有70条国道,约13.1万千米。分三类,第一类是以首都北京为中心,作扇面辐射,共有12条,约3 Road, is for all kinds of vehicles and pedestrians and other engineering facilities. In our country, there are national highway, provincial highway, county road and rural road. State Road is in the national road network, with the national political, economic, national defense significance, and has been identified as the national trunk highway. At present, there are 70 national highways in our country, about 131,000 km. Divided into three categories, the first category is based in Beijing as the center for the fan radiation, a total of 12, about 3