Qinling Zhongnanshan Highway Tunnel is located in Zhong Nanshan, Qinling Mountain, Shaanxi Province. It is the longest double-tunnel expressway tunnel in the world. The length of a single tunnel is 18.02 km, and the length of a double tunnel is 36.04 km15min.

2. Xishan Tunnel (13.6km, completed)

The total length of Xishan Tunnel Group of Taigu Expressway is 15km, including Xishan Extra-long Tunnel 13.6km, Xishan No.2 Tunnel10.4 km, and the minimum distance between the entrances and exits of the two tunnels is 180m, which makes Taigu Expressway project the first batch of risk assessment pilot projects of the Ministry of Transport, and it is recognized that the construction difficulty is the first in China.

3. Nishan Tunnel (10.004km, completed)

Nishan Tunnel is located at the intersection of Qinghai-Tibet Plateau and Sichuan Basin. The edge of Longmenshan fault zone is the key control project of Yaxi Expressway. The second longest highway tunnel in Sichuan Province (total length of the new Erlangshan tunnel 13459 meters) was built.

4. Maijishan Tunnel (12.29 km, completed)

Maijishan Tunnel is the number one control project of Baotian Expressway connecting Baoji, Shaanxi and Tianshui, Gansu. Maijishan Tunnel is located in Maiji District, Tianshui City, Gansu Province, with a total length of 12.29 km. It is the second longest two-lane highway tunnel in Asia after Zhongnanshan Tunnel in China. The project started in February 2005 and was completed on June 3, 2009.

In addition, there are Chagangliang Tunnel (22.6km, planned), Huangtuliang Tunnel (13km, planned), Marcand Tunnel (12km, planned), Erlangshan Tunnel (13.4km, planned) and Micangshan Tunnel (65438).

Baidu Baike-Nishan Tunnel

Baidu Baike-Maijishan Tunnel

Baidu encyclopedia-Taiyuan Xishan tunnel

Baidu Encyclopedia-Qinling Zhongnanshan Tunnel