[1] It never came into existence due to the political status of Taiwan.

The People's Republic of China claims control over Taiwan while it is currently administered and controlled by the Republic of China.

Taiwan has its own highway system and does not recognize the designation by the People's Republic of China.

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).