Workers install the last carling at construction site of the south main bay of the Erqi Yangtze River Bridge in Wuhan, capital of central China's Hubei Province, Aug. 18, 2011. The two sections of the south main bay of the bridge were joined on Thursday. The 6,507-meter-long bridge with six lanes is expected to open at the end of 2011. [Xinhua/Cheng Min]