Vehicles move on a highway in southwest China's Chongqing Municipality, Jan. 5, 2011. As cold waves came to Chongqing, several highway in the municipality were covered with ice. Local government in Chongqing enacted emergency procedures aiming to ensure the operation of road traffic. [Xinhua]

A traffic policeman guides the flow of vehicles on a highway in southwest China's Chongqing Municipality, Jan. 5, 2011. As cold waves came to Chongqing, several highway in the municipality were covered with ice. Local government in Chongqing enacted emergency procedures aiming to ensure the operation of road traffic. [Xinhua]