1, Chengdu-Wanyuan Expressway, referred to as Wan Cheng Expressway for short, numbered S 1, is one of the Chengdu radiation lines planned in Sichuan Expressway Network Planning (20 14~2030). The line starts from Dafeng Hub in Dafeng Street, Xindu District, Chengdu (communicating with G4202 Chengdu Ring Expressway), along Chengdu-Pengzhou-shifang city-Mianzhu-Mianyang-Zitong County-Cangxi County-Bazhong City-Tongjiang County-Wanyuan City, and ends at Guandu Hub in guandu town, Wanyuan City, Dazhou City (communicating with G65 Baomao Expressway).

2. The line consists of Chengpeng Expressway, Chengdu-Mianyang Expressway Double Line, Mianyang Ring Expressway South Ring, Mianyang-Cangxi Expressway, Cangxi-Bazhong Expressway, Banan Expressway enyang-Dongxing Field (with G5012 * * *), Bazhong-Wanyuan Expressway, etc. Deducting repeated sections, the planned mileage is 457km. The Highway Administration Bureau of Sichuan Provincial Department of Transportation announced that from 20 19 to 20 15, the sections of Cheng Peng Expressway, Chengmian Expressway, Mianyang Ring Expressway and Banan Expressway from enyang to Dongxingchang were changed to S 1.