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. Getty Images logo Getty Images 27 months ago

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.