Photo taken on May 21, 2019 shows a bridge across the Jinshajiang River between Batang County of southwest China's Sichuan and Mangkam County of southwest China's Tibet Autonomous Region. Along the Sichuan-Tibet Highway, there are various new and old bridges. Crossing mountains and rivers, these bridges are not only the key junctions on this line, but also splendid landscapes. Over the past 60 years, the highway and the bridges along it have been continuously upgraded and perfected, which has become a miniature of the highway traffic development in China. (Xinhua/Li Xin)

Aerial photo taken on May 15, 2019 shows the Polonggou grand bridge in Bomi County, Nyingchi of southwest China's Tibet Autonomous Region. Along the Sichuan-Tibet Highway, there are various new and old bridges. Crossing mountains and rivers, these bridges are not only the key junctions on this line, but also splendid landscapes. Over the past 60 years, the highway and the bridges along it have been continuously upgraded and perfected, which has become a miniature of the highway traffic development in China. (Xinhua/Li Xin)

Aerial photo taken on May 15, 2019 shows three bridges built at different time in Bomi County, Nyingchi of southwest China's Tibet Autonomous Region. Along the Sichuan-Tibet Highway, there are various new and old bridges. Crossing mountains and rivers, these bridges are not only the key junctions on this line, but also splendid landscapes. Over the past 60 years, the highway and the bridges along it have been continuously upgraded and perfected, which has become a miniature of the highway traffic development in China. (Xinhua/Li Xin)

Photo taken on June 24, 2019 shows the Feixian'guan suspension bridge between Feixian'guan Town in Lushan County and Duogong Township of Tianquan County in southwest China's Sichuan Province. Along the Sichuan-Tibet Highway, there are various new and old bridges. Crossing mountains and rivers, these bridges are not only the key junctions on this line, but also splendid landscapes. Over the past 60 years, the highway and the bridges along it have been continuously upgraded and perfected, which has become a miniature of the highway traffic development in China. (Xinhua/Jiang Hongjing)

A bus is seen on Nujiang Bridge in Baxoi County of Qamdo City, southwest China's Tibet Autonomous Region, May 19, 2019. Along the Sichuan-Tibet Highway, there are various new and old bridges. Crossing mountains and rivers, these bridges are not only the key junctions on this line, but also splendid landscapes. Over the past 60 years, the highway and the bridges along it have been continuously upgraded and perfected, which has become a miniature of the highway traffic development in China. (Xinhua/Li Xin)

Photo taken on June 24, 2019 shows the Feixian'guan suspension bridge between Feixian'guan Town in Lushan County and Duogong Township of Tianquan County in southwest China's Sichuan Province. Along the Sichuan-Tibet Highway, there are various new and old bridges. Crossing mountains and rivers, these bridges are not only the key junctions on this line, but also splendid landscapes. Over the past 60 years, the highway and the bridges along it have been continuously upgraded and perfected, which has become a miniature of the highway traffic development in China. (Xinhua/Jiang Hongjing)