Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Zengfu service area of the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)

Aerial photo taken on Oct. 20, 2020 shows the Nanchuan-Liangjiang expressway in southwest China's Chongqing. An expressway linking Nanchuan District and Liangjiang New Area in southwest China's Chongqing Municipality was put into operation on Tuesday. The 77-kilometer-long expressway started its construction in 2016. (Xinhua/Huang Wei)