Two policemen guide traffic in the Hailin section of the expressway linking Harbin and Mudanjiang City, northeast China's Heilongjiang Province, April 25, 2011. The transportation of the expressway from Harbin to Mudanjiang was influenced due to continuous snowfall since April 22. Seven snow-sweeping vehicles were dispatched to clear snow and ice covering on the road to ensure the traffic safety. [Xinhua/Zhang Chunxiang]