In order to reduce the potential driving risk of the highway reconstruction project caused by the reservation of median separator, it is important to optimize and evaluate the safety of length and loca⁃tion of median separator in entrance and exit of highway interchanges and service areas. Based on the in⁃terchange flow theory, critical gap theory, queuing theory, and the analysis of driving behavior character⁃istics of interchange and conflict, taking Luoyang-Sanmenxia Expressway reconstruction project as anexample, the length of the initiating section, the middle section and the terminal section of the median separator opening were calculated, and the method of setting up the opening length of the old road at the interchange and service area before and after the one side widening was determined. After the analysis of its safety, the rational location of the median separator opening was confirmed considering the layout of the notice sign boards of the approaches. The research results show that the length and the position set⁃ting of the median separator opening of the expressway reconstruction project can be effectively acquired by quantitative calculation, which can effectively induce the driver to pass in and out the interchange flow zone with safety and comfort.%为了降低高速公路改扩建项目中老路中央分隔带的保留所增加的潜在行车风险，对高速公路改扩建工程中互通式立交、服务区出入口中央分隔带的开口长度及位置进行了安全性分析。基于交织理论、可穿越间隙理论、排队论等相关理论，从服务区交织和冲突的驾驶行为特性分析出发，以洛阳至三门峡高速公路扩建工程为例，对中央分隔带进出口开口始端、开口中间区、开口末端长度进行计算，确定了高速公路单侧加宽工程立交、服务区前后老路中央分隔带开口长度设置的方法，并在分析了其安全性之后，结合出入口预告标志牌的布设位置得到中央分隔带合理的开口位置。研究结果表明，该高速公路改扩建中央分隔带开口长度及位置设置可以通过定量计算得到，能有效诱导驾驶员安全、舒适地出入中央分隔带封闭区。
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