高速公路交织区服务水平敏感性分析

Analysis on Service Level Sensitivity of Expressway Weaving Section

影响交织区服务水平的主要因素包括交通流量、交织流量比、自由流速度、交织区长度、交织区内车道数和交织构型等。选取西安绕城高速公路吕小寨立交-朱宏路立交之间交织区为调查对象,开展道路条件和交通流运行状况调查。运用调查数据对美国道路通行能力手册(HCM2010)交织区交织速度和非交织速度预测模型进行修正,重新标定相关参数。基于该速度预测修正模型,利用Visual Basic语言开发交织区运行分析计算工具,定量分析影响因素对交织区通行能力和服务水平的敏感性。

The main factors influencing the service level of weaving section include traffic volume, weaving volume ratio, free flow speed, length of weaving section, lane numbers in weaving section and weaving configuration, etc. Selecting the weaving section between L1J Xiaozhai Overpass and Zhuhong Road Overpass on Xi＇an ring expressway as the object, the road conditions and the traffic flow operation conditions in weaving section is investigated. The predicting model of weaving vehicle speed and non-weaving vehicle speed in weaving section in US HCM2010 is revised by using the survey data, and the relevant parameters of the model are recalibrated. Based on this revised model, the sensitivity of the influencing factors to the capacity and service level of the weaving section is quantitatively analyzed by a calculating tool of weaving section operation developed with Visual Basic language.