Ya-Xi express-way, in mountainous South-West China, highest altitude point is 2,450M. Built on complicated geological conditions (crossing 2 fault zones with seasonal snowing and freezing), 240 KM long in total, including 270 bridges and 25 tunnels, bridge&tunnel percentage 54%. Ya-Xi express-way construction started in 06/2008 and scheduled to open in 06/2012.
雅西(雅安市—西昌市)高速公路是国家高速公路网首都放射线G5京昆高速公路(北京至­昆明)四川省境内的一段，全长240公里，概算总投资为163.77亿元。雅西高速全­线桥梁270座、隧道25座，桥梁隧道比例占线路全长的54.25%，其中特长隧道、­特大桥众多。

实地照片 (field photos):
雅西高速公路 (Ya-Xi Express-way)
http://i95.photobucket.com/albums/l15...
干海子特大桥 (Gan-hai-zi Extra-Long Bridge)
http://i95.photobucket.com/albums/l15...
雅西高速被大雪覆盖 (Ya-Xi Express-way under heavy snow)
http://i95.photobucket.com/albums/l15...

双螺旋隧道图示 (Double-Spin Tunnel Demo)
http://i95.photobucket.com/albums/l15...