The first foundation pile of S7 highway elevated highway was completed in April 2020 and will be completed only one year later. In one year, more than 5400 concrete piles, 500 platforms, 500 support columns and 740 bridge decks were assembled, setting a new record for infrastructure construction in Shanghai. More than 95% of building materials are prefabricated, reducing labor demand, safety risk, noise and air pollution by 90%.