①China's roads according to its administrative level is mainly divided into national highways (including national highways), provincial highways, county roads, three levels, by the country, provinces, counties, three characters by the first letter of the Hanyu Pinyin G, S, X as their respective identifiers, identifiers and numbers form the number.

② National Highway trunk line number, by the national highway identifier "G", the trunk line logo "0" plus two digits sequential number, such as Figure 1 shows the National Highway 302 line.

National highway radial line number, by the national highway identifier "G", radial line identification "1" and two-digit sequential number composed of Beijing as the starting point, the end of the radial line for the end point, according to the clockwise direction of the route arranged in the number, such as G101 Beijing to Shenyang (referred to as the Beijing-Shenyang line).

The numbering of national highway north-south longitudinal line consists of national highway identifier "G", north-south longitudinal line identifier "2" (even) and two-digit sequential numbering, such as G204 Yantai-Shanghai (referred to as Yantai-Shanghai line).

The number of the national highway east-west transverse line, by the national highway identifier "G", east-west transverse line identification "3" (odd) and two-digit sequential number, such as the G318 Shanghai to Nyalam (referred to as Shanghai-Nepal line).

3 Provincial Roads, the number of provincial administrative areas for the scope of the preparation. Provincial highway radial number, by the provincial highway identifier "S", radial identification "1" and two-digit sequential number, such as S120; North-South longitudinal number, by the provincial highway identifier "S The number of north-south longitudinal line is composed of provincial road identifier "S", north-south longitudinal line identifier "2" (even) and two-digit sequential number; the number of east-west transverse line of provincial highway is composed of provincial road identifier "S", east-west transverse line identifier "3" (odd) and two-digit sequential number. " (odd) and two-digit sequential number.

4 County Roads in principle to the administrative region as the scope of the preparation of the county road identifier "X", the method will not be repeated here