Damaged vehicles wait to be towed off the highway after 52 car pile-ups happened in less tan two hours, in Chengdu, Southwest China's Sichuan province, Dec 13, 2010. Nine people were injured and 137 vehicles damaged after 52 pile-ups occurred on the same stretch of road in less than two hours. Sudden heavy fog was blamed as the cause of the series of crashes on a highway in Chengdu, Southwest China's Sichuan province on Dec 13. [CFP]