② The serial number of national and provincial trunk lines consists of national and provincial trunk line identification "G", trunk line identification "0" and two-digit serial number, as shown in figure 1, which stands for National Highway 302. The national highway radiographic number consists of the national highway logo "G", the ray logo "1" and the two-digit serial number, starting from Beijing and ending at the stop point of the ray, and the numbers are arranged clockwise along the route, such as G1kloc-0/Beijing-Shenyang (referred to as Beijing-Shenyang line for short).
The serial number of the north-south longitudinal line of the national highway consists of the national highway logo "G", the north-south longitudinal line logo "2" (even number) and a two-digit serial number, such as G204 Yanhu Line. The serial number of the east-west horizontal line of the national highway consists of the national highway logo "G", the east-west horizontal line logo "3" (odd number) and the two-digit serial number, such as G3 18 Shanghai-Nyalam (Shanghai-Nyalam Line for short).
(3) The numbering of provincial highways shall be based on the provincial administrative region. The number of the dart radiation consists of the dart identifier "S", the radiation identifier "1" and a two-digit serial number, such as S120; ; The north-south longitudinal line number consists of the provincial road mark "S", the north-south longitudinal line mark "2" (even number) and the two-digit serial number; The serial number of the east-west horizontal line of the dart consists of the dart identifier "S", the east-west horizontal line identifier "3" (odd number) and the two-digit serial number.
Extended data
198 1 With the approval of the State Council, the national trunk highway network was officially put into use. The national trunk highway network adopts the layout of combining radiation with network, which is formed by connecting existing trunk highways with national political, economic and national defense significance, with 70 lines and a total length of 6,543,809,000 kilometers. Can be divided into the following three types:
1. The national radiation trunk line with the capital as the center 12, with a total length of 23,997 kilometers, has serial numbers from 10 1 to12;
2. North-South longitudinal lines, 28, with a total length of 37,268 kilometers, with serial numbers ranging from 20 1 to 228;
3. East-west horizontal line, with 30 lines, with a total length of 48,855 kilometers, with serial numbers ranging from 30 1 to 330.
1993, based on the national expressway network, the national expressway trunk line system was put forward, and its technical standards were high-grade highways, namely expressway, first-class highway and second-class automobile highway.
This trunk line system is an integral part of comprehensive transportation corridor, which has a relatively complete security, communication and comprehensive management service system. National trunk lines connect the capital Beijing with provincial capitals, all megacities with a population of over 6,543,800+and most cities with a population of over 500,000.
The layout of the national trunk line is "five verticals and seven horizontals" * *12, with a total length of about 35,000 kilometers, which is expected to be completed in 20 10. The trunk line of "five verticals and seven horizontals" begins with the word "0". National highways are numbered with three digits, and the first digit is the classification number of the layout.
Baidu Encyclopedia: National Highway Number