A six-lane road tunnel under the Yangtze River in Nanjing, designed to ease congestion in the city, is expected to open for traffic in June next year, according to Xinhua.

Cars will be able to travel at speeds up to 80 kph in the tunnel, which will be able to handle twice the number of vehicles currently carried by the Nanjing Yangtze River Bridge.

A four-lane tunnel under the Yangtze in Wuhan was opened in December last year.