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What's the highway number?
Expressway number is the number of expressway, and the grade and direction of expressway can be determined by expressway number. The national highway starts with G, and the number 1/2 represents the national highway. There are seven radial expressways from Beijing, numbered G 1-G7.

There are 9 expressways in the north-south direction, numbered with two odd numbers, with the range of G 1 1-G89. The east-west expressway 18 is numbered with two even numbers, and the range is G 10-G90. There are 4 regional high-speed loop lines numbered G9 1-G99.

Brief introduction of other situations of expressway.

Expressway is a kind of highway classified according to technical grade, which is higher than first-class highway, second-class highway, third-class highway, fourth-class highway and other highways. Expressway and national highway or provincial highway under the classification of road network state are cross-related, that is, expressway is a part of China Road or provincial highway of road network.