综观国内外高速公路建设情况,提高既有高速公路服务水平的方式不外乎新建复线和利用原路改扩建两种主要的扩容方式。该文结合京港澳高速公路湖北段扩容方案研究的工程实例,对比分析新建复线和改扩建两种扩容方式的优缺点,以及两种不同扩容方案的衔接,并确定最优方案,为以后同类型高速公路选择何种扩容方案比选提供参考。 Looking at the situation of expressway construction at home and abroad, ways to improve the service level of existing expressways are no more than two major ways of expanding new ones and using existing ones. Based on the engineering examples of the expansion project of Beijing-Hong Kong-Macau Expressway in Hubei Province, the advantages and disadvantages of the two expansion modes of new double-line and expansion and expansion are compared and analyzed, and the convergence of the two different expansion plans is determined. Expressway choose what kind of expansion plan comparison for reference.