[1] This route follows the coastline of Mainland China closely and has a planned length of 7,800 km (4,800 mi).

En route, it will pass through Dalian and Yingkou in Liaoning; Binhai New Area in Tianjin; Huanghua in Hebei; Dongying, Yantai, Weihai, Qinghai, and Rizhao in Shandong; Lianyungang and Nantong in Jiangsu; Shanghai; Jiaxing, Ningbo, Taizhou, Wenzhou, and Ningde in Zhejiang; Fuzhou, Quanzhou, and Xiamen in Fujian; Shantou, Shenzhen, Zhuhai, Zhanjiang in Guangdong; and Beihai and Fangchenggang in Guangxi.

[4] In late 2015 and early 2016, the government put out requests for tenders relating to various segments of G228 in Wenzhou, including for a bridge to be built on the Ao River [zh] for the Pingyang County to Cangnan County segment of the highway, and for work on the Longsha Township (龙沙乡) to Dailing She Ethnic Township segment.

[7][8] 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).