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expressway The expressway network of China is an integrated system of national and provincial-level expressways in the People's Republic of China. It is the world's largest expressway system by length, having surpassed the overall length of the American Interstate Highway System in 2011. At the end of 2014, the total length of the network was 111,950 kilometres (69,560 mi), of which 7,450 kilometres (4,630 mi) of expressways were built in that year alone.

A system of national-level expressways, officially known as the National Trunk Highway System (simplified Chinese: 中国国家高速公路网; Pinyin: Zhōngguó Guójiā Gāosù Gōnglùwǎng) and abbreviated NTHS, with 7 radial expressways (from the capital Beijing), 9 north-south expressways and 18 east-west expressways, forms the backbone of the expressway network in the country. This backbone is known as the 7918 network (simplified Chinese: 7918网; Pinyin: 7918 wǎng). In addition, the provincial-level divisions of China each have their own expressway systems.

Expressways in China are a fairly recent addition to the transportation infrastructure in the country. Previously, the national road network consisted of a system of at-grade China National Highways. China's first expressway, the Shanghai–Jiading Expressway, opened in October 1988.This 17.37 kilometres (10.79 mi) expressway now forms part of Shanghai's expressway network. The early 1990s saw the start of the country's massive plan to upgrade its network of roads. In 1999, the length of the network exceeded 10,000 kilometres (6,200 mi) in length.Many of the major expressways parallel routes of the older China National Highways.

G42 The Shanghai–Nanjing Expressway (simplified Chinese: 沪宁高速公路; traditional Chinese: 滬寧高速公路; pinyin: Hùníng Gāosùgōnglù) is a modern, enclosed, four-lane, two-way highway. Each lane is 3.75 meters (12.3 ft) wide, and the highway's roadbed is 26 meters (85 ft) wide. There is a 3-metre (9.8 ft) dividing strip in the center of the highway and a 2.5-metre (8 ft 2 in) emergency parking area on each side of the highway. The speed limit is 120 kilometers per hour (75 mph). It is 274 kilometers (170 miles) in length. It runs from Zhenru, Shanghai to Maqun, Nanjing via Anting, Kunshan, Suzhou, Shuofang (硕放街道), Wuxi, Changzhou, Danyang, Zhenjiang and Jurong. The Shanghai section is 25.87 kilometers (16.07 miles) in length, and the Jiangsu section is 248.21 kilometers (154.23 miles) long. The Zhenjiang section (a branch highway) is 10.25 kilometers (6.37 miles) long. In Shanghai, the highway is coterminous with G2 Beijing–Shanghai Expressway and G42 Shanghai–Chengdu Expressway.

The expressway began construction on June 14, 1992, was completed in February 1996, and opened to traffic November 28, 1996. That year, it was listed as a key national construction project.

As the first highway in Jiangsu province, the Shanghai–Nanjing Expressway has up-to-date charge, monitoring, communications, lighting, safety and service facilities. It has improved transportation in Jiangsu and Shanghai, and encourages development along its length.


China National Highway 312 (312国道), also referred to as Route 312 or The Mother Road, is a key east-west route beginning in Shanghai and ending at Khorgas, Xinjiang in the Ili River valley, on the border with Kazakhstan. In total it spans 4,967 km (3,086 mi), passing through Jiangsu, Anhui, Henan, Shaanxi, Gansu before ending in Xinjiang. Besides Shanghai, cities of note on the route include Suzhou, Wuxi, Nanjing, Hefei, Xinyang, Nanyang, Xi'an, Lanzhou, Jiayuguan and Ürümqi.

The road was the subject of Rob Gifford's 2007 book China Road, in which he describes traveling the entire length of Route 312 from the East China Sea to Central Asia.
The G40 Shanghai–Xi'an Expressway has replaced National Highway 312 as the main route between those two cities.


Wuxi-Yixing Expressway
(Xi Yi Gao Su 锡宜高速)
In Yixing the S48 is ending and with the G25 the connection to Hangzhou is given.

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