China has opened the world's longest bridge over water, the 41.58km Jiaozhou Bay Bridge, which is said to have cost well over US$2 billion to build. It links the eastern port city of Qingdao to Huangdao Island across Jiaozhou Bay and is 4km longer than the previous longest bridge over water, the Lake Pontchartrain Causeway in Louisiana, USA. Opened in June, 2011 after four years of construction, the link is expected to carry some 30,000 vehicle/day and will reduce travel time by 30 minutes, although it is o