Combo aerial photo shows the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, on March 8, 2019 (top), on April 3, 2020 (middle), and on Feb. 2, 2021 (bottom). With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)

Workers work at the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, Feb. 2, 2021. With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)

A worker works at the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, Feb. 2, 2021. With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)

Aerial photo shows workers working at the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, Feb. 2, 2021. With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)

A worker works at the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, Feb. 2, 2021. With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)

Workers work at the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, Feb. 2, 2021. With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)

Aerial photo shows workers working at the construction site of Fenghuang Road Yellow River Bridge in Jinan, east China's Shandong Province, Feb. 2, 2021. With the main structure of its three towers being completed recently, the 6,683-meter-long self-anchored suspension bridge is expected to open to traffic at the end of 2021. (Xinhua/Wang Kai)