China National Highway 317 (G317) runs broadly west to east from Chengdu, Sichuan to Gar County, Ngari Prefecture, Tibet.

It is 2,028 kilometres in length and forms an important transportation route in Tibet.

[1] As of 2017, Highway 317 passes through the highest vehicular tunnel in the world in the Chola Mountains of Dêgê County.

[3] China National Highway 112 runs around Beijing Before 2013, Mainland China observed National Highway 228 as Taiwan Ring, composed of several National Expressway (Republic of China) and Taiwan provincial highways, this designation is not recognized by Republic of China (Taiwan).

Another extension plan was announced in 2022, including new small purpose connection highways (601-701).