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立交节点是北京市快速路系统的重要组成部分，研究其服务水平评价方法，评估其交通运行质量，对分析北京市快速路立交节点交通拥堵问题根源以及解决对策的提出均具有重要意义. 论文分析了北京市快速路系统立交主要形式和种类，提出了立交服务水平的概念. 在此基础上提出了用平均行程车速、合分流点交通量和交织车速为指标，分别确定立交主线、匝道、交织区服务水平，并参考相关文献提出了评价标准. 最后论文选取北京市快速路系统中的重要立交节点——马甸桥为例，应用本文提出的互通式立交服务水平评价法和评价标准对其服务水平进行研究，结果表明该方法具有较好的应用价值.

LOS Evaluation Methods of Beijing Expressway Interchange Nodes

The interchange nodes are main parts of Beijing urban expressway system. Exploring evaluation methods and estimating the LOS of interchange nodes have great significance to identify the traffic jam formulation and propose relevant countermeasures. The paper analyzes main type and category of Beijing urban expressway interchanges and presents concept about urban interchange LOS. Then, using the index of travel speed, traffic volume of off-ramp and on-ramp, and speed of weaving and non-weaving sections, the LOS are evaluated for the main line, ramp and weaving sections. The LOS criterion is provided. At the final section, the Madian interchange, a very important intersection of Beijing urban expressway, is selected as an example to estimate its LOS and test the effeteness of the proposed method.