Regulation China National Highways

toll plaza on combined g106/g316 in center of town of futu, in huangshi municipality, hubei

although accepted speed limit on china national highways 100 km/h, common see cars pass other in in excess of 100 km/h. lack of speed detection cameras on routes, lack of posted speed limit outside of localities , tremendous distances of road mileage, means enforcing speed limit rather herculean. in addition there notable shortage of traffic police in mainland china.

nationwide highways begin letter g, followed 3 numerals, e.g.: g107. said g stands 国家 (guójiā), or national.

the numbering of highways follows:

five vertical , 7 horizontal main routes labelled in former 000 series (the so-called 5 downs , 7 acrosses ), although these have been deprecated in favour of nths (7918) system.
highways in 100 series (e.g. 102, 106) begin beijing - capital city of people s republic of china - , spread out in compass directions, except china national highway 112, originates in xuanhua ring around beijing.
highways in 200 series stretch north south (e.g., hohhot in inner mongolia through beihai in guangxi province);
highways in 300 series stretch east west (e.g., shanghai through ruili in yunnan province);
highways in 500 series connecting roads between other national highways.

in major cities, there gap in road within city.