随着城市交通的繁荣与发展,北方冬季地面覆盖的冰雪对城镇道路、公路交通的危害越来越大。特别是在高速公路、机场、城市道路上,积雪不仅堵塞交通,而且是造成交通事故发生的重要原因。据统计,到2 0 0 2年底,国内高速公路的通车里程已达2 5 2万km ,其中1/ 3左右处于北方降雪带 With the prosperity and development of urban traffic, the snow and ice covered by the winter land in the north are more and more harmful to urban roads and road traffic. Especially in the expressway, airport, urban roads, snow not only blocked traffic, but also an important cause of traffic accidents. According to statistics, by the end of 2002, the number of domestic freeways has reached 25 2 million km, of which about 1/3 of them are in the northern snow belt