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The China National Highways (Chinese: t , s , p ''Zhōnghuá Rénmín Gònghéguó Guódào'') are a series of trunk roads across mainland China. Although they are called "highways" (e.g., the Jingbao Highway), they are not necessarily freeways. However, like expressways, a toll is sometimes charged. ==Regulation== Although an accepted speed limit on China National Highways is 100 km/h, it is common to see cars pass other by in well in excess of 100 km/h. The lack of speed detection cameras on some routes, lack of a posted speed limit outside of localities and tremendous distances of road mileage, means that enforcing this speed limit is rather herculean. In addition there is a notable shortage of traffic police in mainland China. Nationwide highways often begin with the letter G, followed by three numerals, e.g.: G107. It is said that the G stands for 国家 (''guójiā''), or national.〔(China's Highroad to Highway Success )〕 The numbering of the highways is as follows: * Five vertical and seven horizontal main routes were labelled in the former 000 series (the so-called "five downs and seven acrosses"), although these have been deprecated in favour of the "NTHS" (7918) system. * Highways in the 100 series (e.g. 102, 106) begin from Beijing - the capital city of the People's Republic of China - and spread out in all compass directions, except for China National Highway 112, which originates in Xuanhua as it is a ring around Beijing. * Highways in the 200 series stretch from north to south (e.g., from Hohhot in Inner Mongolia through to Beihai in Guangxi province); * Highways in the 300 series stretch from east to west (e.g., from Shanghai through to Ruili in Yunnan province); * Highways in the 500 series are connecting roads between other national highways. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「China National Highways」の詳細全文を読む スポンサード リンク
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