Tseung Kwan O Cross Bay Bridge in China's Hong Kong Special Administrative Region (HKSAR) opened to traffic on December 11, becoming the first major bridge built exclusively by a Chinese mainland company in the HKSAR. Built over four years, the bridge has the longest span and heaviest steel arch in the HKSAR. The steel bridge components were prefabricated on the mainland. It is also the first marine viaduct in the HKSAR with a carriageway, a footpath, a cycle track and viewing platforms at the same time.