Vehicles run on the No.4 Nanjing Yangtze River Bridge in Nanjing, capital of east China's Jiangsu Province, Dec. 24, 2012. The bridge was opened to traffic on Monday. The 28.966-kilometer-long suspension bridge supported by two towers and three spans, has a 1,418-meter-long main span, the longest among the same kind bridges in China and the third longest in the world. [Xinhua]