Three people were killed and five injured when an eight-lane suspension bridge in Harbin city collapsed just nine months after it opened, state media said.
The bridge, part of an airport expressway, cost $367.6 million to construct over two years, China News Service reported.
A 100m section broke off when four heavy trucks drove on to the bridge, plunging them to the ground and crushing them, said a CCTV news reporter at the scene. The bridge was designed to handle up to 9800 vehicles an hour.
Two people were killed and a third died later. Five more were injured and being treated in hospital, the report said, adding that authorities were investigating.
The official Xinhua news agency said at least six major bridges had collapsed across the country since July last year.
China has rapidly expanded its road and rail infrastructure over the past decade as its economy has boomed, but critics say that safety has sometimes been overlooked.