World’s longest ocean bridge under way in China.

The U.S. $1.9 billion bridge spans the Bay of Hangzhou on the East China Sea, crossing the Quintang River at the Yangtze River Delta in Zhejiang Province south of Shanghai.
The Delta area is said to be one of the world’s most complicated sea environments, with one of the three highest tides on Earth. It also has typhoons and difficult soil conditions. Following a decade of studies, the crossing is being built by China Railway Bridge Bureau Group for completion in 2008. Wang Yong is chief director of the project.
The bridge is six lanes wide, 36 kilometres long, of which 32 kilometres is over the sea. It has an S-shaped plan, with arched nagivation openings and a main cable-stayed span. A 10,000-square metre platform is being constructed 14 kilometres out from the southern bank to serve as a construction base and rescue facility, and later as a mid-crossing service station for cars.
Over 45,000 cars per day are expected to use the crossing, which will shorten the land distance between Shanghai and Ningbo by over 120 kilometres.
The Hangzhou Bay Bridge is to be a model for the building of other cross-sea bridges in China. According to the Chinese Government, plans for a number of cross-sea bridges, such as the Bohai Bay Bridge, Huangdao Island Bridge, East China Sea Bridge and Zhoushan Island Bridge are under way. Combined investment in these projects will exceed 100 billion yuan.
Global Positioning System technology is being used to provide millimetre-accuracy for the real time positioning of piles and prefabricated sections.
The main construction began in June last year, and it is expected to be completed in another four years.