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1993年,我国在国道网基础上,提出了国道主干线系统。其技术标准是以汽车专用公路为主的高等级公路,即高速公路、一级公路和二级汽车专用公路。这个主干线系统是全国综合运输大通道的组成部分,拥有比较完善的安全保障、通信和综合管理服务体系。国道主干线连接了首都北京与各省会和所有100万以上人口的特大
In 1993, our country proposed the national trunk line system on the basis of the national highway network. Its technical standards are high-grade highways mainly for motor vehicles, that is, highways, first-class highways and second-class automobiles. This trunk line system is an integral part of the national comprehensive transport corridor and has a relatively complete system of security, communications and integrated management services. The national trunk road connects the capital city of Beijing with all provincial capitals and all over one million population