国道是国家干线公路的简称,是国家综合交通网中的重要干线。我国的国道由以下公路组成:一、首都北京通向各省、直辖市、自治区政治经济中心和三十万人口以上城市的干线公路;二、通向各大港口、铁路枢纽、重要工农业生产基地的干线公路;三、大、中城市通向外对口岸、开放城市、历史名城、重要风景区的干线公路;四、具有重要意义的国际公路。目前我国有国道七十多条,总长十一万多公里,占全国公路全程 National Road is short for National Trunk Highway and is an important trunk line in the national comprehensive transportation network. The national highway in our country is composed of the following highways: 1. The capital city of Beijing leads to the main highways leading to the political and economic centers of all provinces, municipalities and autonomous regions and cities of over 300,000. 2. The major roads leading to the major ports, railway hubs and major industrial and agricultural production bases Main roads; Third, large and medium-sized cities open to the outside ports, open cities, historic cities, important scenic areas of the main road; Fourth, the international road of great significance. At present, there are more than 70 national roads in our country, with a total length of over 110,000 kilometers, accounting for the entire length of the national highway