page_title: Expressways of China
section_title: Exit numbering
hierarchical_section_title: Expressways of China / Expressway nomenclature / Exit numbering
caption_attribution_description: 中文: 中国高速 黔高速S85 都匀方向 332出口 近G75
context_page_description: The expressway network of China, with the national-level expressway system officially known as the National Trunk Highway System, is an integrated system of national and provincial-level expressways in China.
  With the construction of the Shenyang–Dalian Expressway began between the cities of Shenyang and Dalian on 7 June 1984, the Chinese government took an interest in an expressway system. The first modern at-grade China National Highways is the Shanghai–Jiading Expressway, opened in October 1988. The early 1990s saw the start of the country's massive plan to upgrade its network of roads. On 13 January 2005, Zhang Chunxian, China's Minister of Transport introduced the 7918 network, later renamed the 71118 network, composed of a grid of 7 radial expressways from Beijing, 9 north–south expressways, and 18 east–west expressways that would form the backbone of the national expressway system.
  By the end of 2019, the total length of China's expressway network reached 149,600 kilometers, the world's largest expressway system by length, having surpassed the overall length of the American Interstate Highway System in 2011. Planned length is 168,478 kilometeres by 2020.
context_section_description: Exit numbering has been standardised in China from its inception. Most Chinese expressways, especially those in the national network, use distance-based exit numbering, with the last three numbers before the decimal point taken used as the exit number. Hence, an exit present at km 982.7 would be Exit 982, whereas an exit at km 3,121.2 would be Exit 121. Unlike American exit numbering systems that reset at each state line a freeway crosses, exits on Chinese expressways increase along the total length of the freeway, regardless of how many provincial boundaries the expressway crosses.
  Mostly regional expressways still use sequential exit numbering, although even here, new signage feature distance-based exit numbering. Before the 2009–2010 numbering switchover, nearly all of China's expressways used sequential numbering, and a few expressways used Chinese names outright.
  The exit is written inside an oval in green letters to the immediate right of the Chinese word for exit, "出口" (chukou).
caption: An expressway exit in Guizhou
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