CHONGQING, CHINA - OCTOBER 25: A partial view of the construction site of the Caiyuanba Yangtze River Bridge on October 25, 2007 in Chongqing Municipality, China. The Caiyuanba Yangtze River Bridge has the world's longest double-deck, tied-arch main span which is 420 meter long. The bridge will carry six lanes on its upper deck and carry monorail tracks through steel girders on the lower deck.