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Roads in the People's Republic of China are numbered G, S or X, and four different categories (not including expressways and express routes) exist:
Contents
Non-expressways and non-express routes
G, S, and X roads often become city roads as of the delimitation of the city. At the city border, control of the road switches from the gonglu side (public road administration) to the shizheng side (city government).
Expressways and express routes
Expressways of China use a new numbering. The labelling of the former three digit 0-series G routes (e.g. G020) was replaced by a system that uses one digit for expressways starting in Beijing (e.g. G5), two digits for long-distance expressways (e.g. G30) and four digits for regional and local expressways (e.g. G9411).
References
China road numbering Wikipedia(Text) CC BY-SA