基于交通冲突的主干路交织区特性与安全研究  

Characteristics and Safety of Weaving Areas of Trunk Roads Based on Traffic Conflicts

作　　者：王子鸣 李树彬 崔帅[1] WANG Ziming;LI Shubin;CUI Shuai(School of Traffic Engineering,Shandong Jianzhu University,Jinan,Shandong 250101,China;College of Traffic Management Engineering Shandong Police College,Jinan,Shandong 250014,,China)

机构地区：[1]山东建筑大学交通工程学院,山东济南250101 [2]山东警察学院交通管理工程系,山东济南250014

出　　处：《中外公路》2024年第3期236-245,共10页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:71871130);山东省公安厅科技服务项目(编号:SDGP370000000202102003878,SDGP370000000202102003700)。

摘　　要：为了研究城市主干路进口与信控交叉口之间交织区交通冲突特性及各车道安全水平,选取济南经十路某交织区作为调查对象。以一个信号周期为调查间隔,以交通冲突为基础,以碰撞时间(T_(TTC))为指标,通过累计频率法确立交通冲突严重阈值,建立交织区整体交通量、交通密度与交通冲突数的关系模型。再通过主成分分析法以各车道交通冲突严重程度和交通流状况为评价指标,对城市主干路进口与信控交叉口之间交织区各车道进行安全评价并排序。研究结果表明:在交织区交通量少、交通密度低时,冲突数随着交通量和交通密度的增大而增加,当整体交通量达到288辆/(3.5 min),交通密度达到419辆/km时,交通流变为强制流;对各车道的安全评价发现各车道安全区分明显,和主干路入口相邻车道安全性较低,实践证明主成分分析法对于交织区各车道的评价结果正确可靠。This paper selected a weaving area on Jingshi Road in Jinan,China as the investigation object to study the characteristics of traffic conflicts and the safety level of each lane in the weaving area between the entrance of an urban trunk road and a signal-controlled intersection.In this research,a signal period was set as the investigation interval,traffic conflicts were identified as the research basis,and the collision time(T_(TTC))was selected as the index.Severity thresholds of traffic conflicts were established by using the cumulative frequency method,and a model was constructed to represent the relationship among the overall traffic volume,traffic density,and the number of traffic conflicts in the weaving area.Principal component analysis was conducted to evaluate the safety of each lane in the weaving area between the entrance of the urban trunk road and the signalcontrolled intersection.The evaluation indexes included the severity level of traffic conflicts and the traffic flow of each lane.The results show that in weaving areas with low traffic volume and density,traffic conflicts increase with rising traffic volume and density.When the overall traffic volume reaches 288 vehicles/(3.5 min)and the traffic density reaches 419 vehicles/km,the traffic flow becomes a forced flow.In addition,safety evaluations of each lane reveal a significant distinction in safety levels,with lanes adjacent to the entrance of the trunk road exhibiting lower safety.It has proven that principal component analysis provides accurate and reliable results for evaluating lanes in weaving areas.

关 键 词：城市主干路 交织区 交通冲突 交通冲突阈值 主成分分析法 安全评价 

分 类 号：U491[交通运输工程—交通运输规划与管理]