Zhongnanshan Tunnel, or Qinling Zhongnanshan Tunnel in Shaanxi

Shaanxi

' is a province in the central part of Mainland China, and it includes portions of the Loess Plateau on the middle reaches of the Yellow River in addition to the Qinling Mountains across the southern part of this province...

 province, China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, is the longest two-tube road tunnel

Tunnel

A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

 in the world. It is also the second longest road tunnel overall in the world, after the Lærdal Tunnel in Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. The 18040 metres (11.2 mi) long tunnel, crosses under the Zhongnan Mountain (). It opened on 20 January 2007, becoming part of the Xi'an

Xi'an

Xi'an is the capital of the Shaanxi province, and a sub-provincial city in the People's Republic of China. One of the oldest cities in China, with more than 3,100 years of history, the city was known as Chang'an before the Ming Dynasty...

-Ankang

Ankang

Ankang is a city in Shaanxi province, China.- Geography :Ankang is geographically considered to be part of southern China. However, on administrative terms, as Shaanxi is officially part of Northwestern China, it is considered to be part of the Northwest....

 Highway between the Changan and Zhashui counties. The cost to build the tunnel was 3.2 billion yuan

Renminbi

The Renminbi is the official currency of the People's Republic of China . Renminbi is legal tender in mainland China, but not in Hong Kong or Macau. It is issued by the People's Bank of China, the monetary authority of the PRC...

(US$410 million). The maximum embedded depth of the tunnel is 1640 metres below surface level.