Photo shows an aerial view of the Yarlung Zangbo River Grand Bridge. [Photo/Tenzin Lhamze]

In recent years, transportation infrastructure has been continuously improved, and the construction of a comprehensive three-dimensional transportation network has been accelerated in southwest China's Xizang Autonomous Region. At present, the highway mileage has reached 123,300 kilometers in Xizang, including 1,196 kilometers of high-grade highways.