Core Viewpoint - The severe weather conditions, including rain and snow, have led to the complete closure of 18 highways in Heilongjiang Province, impacting transportation during the peak return period after the Spring Festival [1]. Group 1: Highway Closures - A total of 18 highways, including Harbin-Mudanjiang Expressway and Daqing-Guangzhou Expressway, are fully closed due to adverse weather conditions as of 8 AM on February 22 [1]. - Specific highways affected include Harbin-Mudanjiang, Daqing-Guangzhou, and several others, with additional restrictions on certain routes for larger vehicles and hazardous materials [1]. Group 2: Weather Impact - The Heilongjiang Provincial Meteorological Station has issued warnings for severe weather, predicting significant road icing or snow accumulation across most of the province from February 22 to 23 [1]. - Areas such as the southern part of Daxing'anling, Heihe, and northern Qiqihar are expected to experience heavy snow, which will severely affect transportation [2].