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:
Non-expressways and non-express routes
G routes stand for Guodao, or China National Highways. These roads often exist to liaise between different centres.
S routes stand for Shengdao, or provincial roads.
X routes stand for Xiandao, or county-level roads.
A rank below them are the xiangdao, or township-level roads.
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 and express routes are not given any specific numbering at the moment. One possibility, however, has been to label them 0-series G routes (e.g. G020 would be the Jingjintang Expressway).
A roadnumber is a number assigned to a stretch of road, or of a long distance route.
For example, the main road from London to Edinburgh is called the A1 (the "A" in Britain means it is a first class route, more important than "B" roads).
Complicating the issue further is the fact that some states have distinct numbering systems for primary and secondary routes or for state routes and county roads.
North China, which coincides with the Huang He (Yellow River) basin and is bounded in the S by the Qingling Mts., includes the loess plateau of the northwest, the N China plain, and the mountains of the Shandong peninsula.
China is the worlds largest producer of rice and wheat and a major producer of sweet potatoes, sorghum, millet, barley, peanuts, corn, soybeans, and potatoes.
Chinas relations with other Asian nations, at first cordial, were affected by Chinas encouragement of Communist activity within their borders, the suppression of a revolt in Tibet (195960), and undeclared border wars with India in the 1960s over disputed territory.