The steel structure of the junction of the North-South Elevated Road and the Beiheng Passage was completed on Sunday. The last section of the 168-meter steel box beam, which will support the passage over the North-South Elevated Road, was finished around 1am, avoiding disruption to traffic. With the help of a super crane, the 1,475-ton beam was installed 30 meters above the ground over the Tianmu Road Roundabout, where the south-north thoroughfare will join the under-construction Beiheng Passage upon its completion by 2023.