高速公路改扩建同向合流与相邻出口交通组织研究

Research on the Organization of Co-Directional Confluence and Adjacent Exit Traffic of Expressway Reconstruction and Expansion

摘要: 针对高速公路改扩建中主线同向合流点与相邻出口间距过小引发的车辆连续变道冲突及安全风险问题，以长春至深圳国家高速公路河源热水至惠州平南段改扩建工程为背景，选取四角楼互通和麻陂互通为研究对象对改扩建同向分流与相邻出口交通组织研究。基于VISSIM微观仿真平台，构建包含道路几何参数、交通流特性及驾驶行为模型的仿真场景，结合SSAM冲突分析软件，系统评估了多种交通组织方案对通行效率与安全性的影响。研究表明：1) 禁止左幅主线车辆驶出临近出口可显著降低冲突率和延误率，但需强制车辆提前变道；2) 当允许左幅小型车驶出时，缩短导流线长度可优化性能，其中导流线缩短400 m~600 m后，延误率与冲突率下降趋势趋于平稳；3) 合流点–出口间距过小路段的通行效率损失及安全风险显著高于间距较大路段。研究成果揭示了导流线长度与车辆管控策略的协同优化机制，为改扩建工程同类瓶颈路段交通组织提供了新的思路。

Abstract: Against the background of vehicle continuous lane-changing conflicts and safety risks caused by the excessively small distance between the mainline co-directional merging point and adjacent exits in expressway reconstruction and expansion, this study takes the Reconstruction and Expansion Project of the Heyuan Reshui to Huizhou Pingnan Section of the Changchun-Shenzhen National Expressway as the research context, selecting the Sijiaolou Interchange and Mabei Interchange as research objects to investigate the traffic organization of co-directional divergence and adjacent exits in reconstruction and expansion projects. Based on the VISSIM microscopic simulation platform, a simulation scenario incorporating road geometric parameters, traffic flow characteristics, and driving behavior models was constructed. Combined with the SSAM (Surrogate Safety Assessment Model) conflict analysis software, the impact of various traffic organization schemes on traffic efficiency and safety was systematically evaluated. The research results show that: Prohibiting vehicles on the left mainline from exiting at the adjacent exit can significantly reduce the conflict rate and delay rate, but it requires mandatory advance lane changes for vehicles. When allowing small vehicles on the left mainline to exit, shortening the length of the guide line can optimize performance. Specifically, after shortening the guide line by 400~600 meters, the downward trend of the delay rate and conflict rate tends to stabilize. The traffic efficiency loss and safety risks in sections with excessively small merging point-exit distances are significantly higher than those in sections with larger distances. The research findings reveal the collaborative optimization mechanism between guide line length and vehicle control strategies, providing new insights for traffic organization in similar bottleneck sections of reconstruction and expansion projects.