WooHoo !.................mystery solved!
It's the Guoliang Tunnel Road in Hunan Province,China
Mystery solved chronicle-
http://rickmccharles.com/?p=1230
Long Corridor in Cliffs picture site
http://club.auto.sohu.com/forum/thread-460970-1-1.html
Also see "Most Dangerous Roads Part II"
http://thrillingwonder.blogspot.com/...ld-part-2.html
see post 116537