近年来,随着国民经济的快速发展,道路交通运量迅猛增长,公路、城市道路等旧路加宽工程也大量的付诸实施,这些公路随着社会经济的发展和交通量的增加,已经不能满足社会和行车需求,目前土地等不可再生资源的日趋宝贵和紧张,导致旧路加宽工程将是本世纪初公路建设所面临的重要和必须解决的问题。 In recent years, along with the rapid development of the national economy, the volume of road traffic has increased rapidly. Roads, urban roads and other old road widening projects have also been implemented in large numbers. With the development of social economy and the increase of traffic volume, Can not meet social and traffic demand. At present, non-renewable resources like land and land are becoming increasingly valuable and tense. As a result, the old road widening project will be an important and must-be-solved problem for highway construction in the beginning of this century.