2 Lang Cairn Tunnel (2182 meters above sea level or so)
To steep, well-known bad weather in the whole country the Erlang Shan, Sichuan-Tibet line is not only the first thousand miles throat Insurance Commissioner, had been known as the "natural moat."
In 1996, a total investment of 4.4 billion Erlang mountain tunnel construction works are commenced. Days starting from the county as a whole tunnel Longdanxi, Luding County, do not care beyond the village, located in Erlang mountain hillside with a total length 8660 meters, 4172 meters long in which the main tunnel, the tunnel Jingkuan 9 meters, 5 meters high altitude 2182 m, is the linking of road tunnels has been the longest and highest one. Erlang Mountain Tunnel is completed, than the original Sichuan-Tibet highway mileage of 25 km shorter paragraphs Erlang Mountain, shortening journey time 3 hours, and avoid the peak accident, disaster-prone sections of roads to ensure smooth flow of road and driving safety.
At present, the two Lang Cairn Tunnel has been fully open to traffic. Have been completed and two Lang Cairn Tunnel is Asia's longest highway tunnel, the tunnel Ganzi greatly facilitated the completion of the traffic, and affected the entire Ganzi's tourism development, such as Inagi, Danba, so that these areas of tourism on the to a new level.