Vehicles run on the Xigu Yellow River Bridge of South Beltway in Lanzhou, Gansu Province on December 29, 2018. The South Beltway of Lanzhou, capital city of Gansu Province, opened to traffic on Saturday. It is Lanzhou's first beltway which will effectively alleviate the traffic pressure on the city circle. (Photos: Xinhua)

An ariel photo taken on December 29, 2018 shows the South Beltway in Lanzhou, Gansu Province. The South Beltway of Lanzhou, capital city of Gansu Province, opened to traffic on Saturday. It is Lanzhou's first beltway which will effectively alleviate the traffic pressure on the city circle.

Vehicles run on the Xigu Yellow River Bridge of South Beltway in Lanzhou, Gansu Province on December 29, 2018. The South Beltway of Lanzhou, capital city of Gansu Province, opened to traffic on Saturday. It is Lanzhou's first beltway which will effectively alleviate the traffic pressure on the city circle.

An ariel photo taken on December 29, 2018 shows the South Beltway in Lanzhou, Gansu Province. The South Beltway of Lanzhou, capital city of Gansu Province, opened to traffic on Saturday. It is Lanzhou's first beltway which will effectively alleviate the traffic pressure on the city circle.

An ariel photo taken on December 29, 2018 shows the South Beltway in Lanzhou, Gansu Province. The South Beltway of Lanzhou, capital city of Gansu Province, opened to traffic on Saturday. It is Lanzhou's first beltway which will effectively alleviate the traffic pressure on the city circle.