The photo taken on March 2, 2011 shows a closed toll station of the Beijing-Hong Kong-Macao Expressway, a national trunk road, in Xuchang, central China's Henan Province. Xuchang's meteorological agency issued a "red" fog alarm on Wednesday as heavy fog shrouded Xuchang and disrupted the traffic in and out of the fogbound city. [Xinhua/Niu Shupei]