Friendship Highway - China National Highway 318

"The Friendship Highway is a 800 kilometres (500 mi) scenic route connecting the capital of Tibet Lhasa with the Chinese/Nepalese border at the Sino-Nepal Friendship Bridge between Zhangmu and Kodari. It includes the westernmost part of China National Highway 318 (Shanghai-Zhangmu) and crosses three passes over 5,000m before dropping to 1,750m at the border." [more]