High-boundary section of Shanghai-Chongqing Expressway (Gaojie Expressway) is one of the key projects of the National Ninth Five-Year Plan. It is an important part of G50 Shanghai-Chongqing Expressway. It was started construction in 1995 and opened to traffic on May 1, 1999, with a total length of 109.782 km. Gaojie Expressway connects He 'an Expressway in the east and Huanghuang Expressway in Hubei in the west, traversing Huaining County, Qianshan County, Taihu County and Susong County, passing through Tianzhu Mountain and Huating Lake Scenic Area in Taihu County. It is the southwest gateway of Anhui Province and an important east-west transportation trunk line leading to Jiangxi, Hubei, Hunan and other provinces and cities.