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National Highway 228 was a hypothetical highway encircling the island of Taiwan as part of the National Highway System of the People's Republic of China. It had never come 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.
This observation was eventually dropped in new National Highway plans, replaced by the Dandong-Dongxing Highway in 2013.
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). This observation was eventually dropped in new National Highway plans, replaced by Dandong-Dongxing Highway.
A extension plan of the highway system was announced in 2013, including extension of existing highways(101-112, 201-227, 301-330) and new highways (North-South 228-248, East-West 331-361, Connections 501-581). Only small portions of them needs to be constructed from scratch; most of the new highways would be upgraded provincial/county highways.