China National Highway 103 (G103) is the main traffic corridor between Beijing and Tianjin.

It goes from Tongzhou Beijing to Tianjin and then to the coastal area of Binhai on the outskirts of Tianjin, and runs to approximately 163 km.

This is the shortest China National Highway within those that start from 1.

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).