文章总结了在苏嘉杭高速公路南段扩建中,通过采用的不断流、不新增征用土地的资源节约型方式,把标准四车道高速公路扩建为港湾式六车道高速公路方案的研究与实践过程,分析了高速公路扩建工程项目的难点与特点,对不断流情况下的交通组织协调工作进行总结,对特殊施工环境下的施工工艺进行探索,并对扩建后实际运行效果进行初步分析。 This paper summarizes the research and practice of expanding the standard four-lane expressway to a harbor six-lane expressway through the resource-saving way of continuous flow and no land acquisition in the southern section of Su-Jia-Hang Expressway. This paper analyzes the difficulties and characteristics of expressway expansion project, summarizes the coordination of traffic organization under the condition of continuous flow, explores the construction technology in special construction environment, and conducts a preliminary analysis of the actual operation effect after the expansion.