青馬大橋(Tsing Ma Bridge) is a bridge in Hong Kong, China. It is the world's sixth largest suspension bridge. The bridge was named after two of the islands in Hong Kong, namely Tsing Yi and Ma Wan . It has two decks and carries both road and rail traffic, which also makes it the largest suspension bridge of this type. The upper deck carries a dual three-lane carriageway and there are two tracks of railway and a two-lane emergency roadway in the lower deck for maintenance and the diversion of traffic during high winds. It has a main span of 1,377 metres (4,518 ft) (more than the famous Golden Gate Bridge in San Francisco) and a height of 206 metres (676 ft). The span is the largest of all bridges in the world carrying rail traffic.