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Between Shuangyashan and Baoqing County, the highway is under construction as a four-lane road, partially following a new route, part of it superseding County Road 132 and Provincial Highway 205. This section is expected to open in June 2020. Between Baoqing and Mishan, it will be upgraded provincial highway 205.
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.
Another extension plan was announced in 2022, including new small purpose connection highways (601-701).
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National Highway 501
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G221 Jixian
China National Highways (CNH)