Zhongnanshan Tunnel

Zhongnanshan Tunnel
Overview
LocationChina Qinling Mountains
StatusActive
RouteG65 Baotou–Maoming Expressway
StartXi'an Chang'an District
EndShangluo Town
Operation
Work begunMarch 2002
Opened22 December 2007
Technical
Length18.040 km (11.210 mi)
No. of lanesTwo in each tunnel
Operating speedSpeed limit: 80 km/h (50 mph)
Highest elevation1026m
Lowest elevation896m
Width10.9m
Grade1.1%

Zhongnanshan Tunnel, or Qinling Zhongnanshan Tunnel (Chinese: 秦岭终南山公路隧道) in Shaanxi province, China, is the longest two-tube road tunnel in China.[1] It is also the fourth longest road tunnel overall in the world, after the Lærdal Tunnel in Norway, the Yamate Tunnel in Japan[1] and WestConnex in Australia. The 18,040-metre (11.21 mi) long tunnel, crosses under the Zhongnan Mountain (Zhongnanshan). It opened on 20 January 2007, becoming part of the Xi'an-Ankang Highway between the Changan and Zhashui counties.[1] The cost to build the tunnel was 3.2 billion yuan (US$410 million).[1] The maximum embedded depth of the tunnel is 1640 metres below surface level.[1]