The Dao'an Expressway is the third vertical line of the “678” network of the Guizhou highway plan. The project starts at the Fushou field at the junction of Daozhen County, Guizhou Province and Nanchuan District, Chongqing City, and passes by Daozhen, Zheng'an, Meitan, Yuqing Lujiazhai in An County is connected to Guixin Expressway.

Zhengkang High Speed ​​Rail No. 7 Division 2 Baokang Tunnel has an import mileage of D1K499 + 420, an exit mileage of D1K513 + 980, a total length of 1,460m, and a dual-line tunnel with a design speed of 350km / h.

The Weisan Road Crossing River Tunnel Project is located 5km upstream of the Nanjing Yangtze River Bridge, connecting Nanjing's main urban area in Nanjing with Pukou New Area in Jiangbei.