What is unique about the Hangzhou Bay Bridge?

This is a bridge across Hangzhou Bay off the eastern coast of China. It links the municipalities of Shanghai and Ningbo in Zhejiang province. It’s the longest transoceanic bridge in the world although it does not have the longest cable-stayed main span. The bridge is 36 km long with six expressway lanes in two directions. The construction started on June 8, 2003 and was completed on June 14, 2007. It’s not open for public transportation but is only being used for test and evaluation purpose.