基于慢行交通密度的转角交通岛设置方法研究

Study on the Setting Methodology of Channelized Islands Based on Non-Motorized Traffic Density

摘要: 转角交通岛是平面交叉口重要的渠化交通设施，其设置条件和设计方法存在较大争议。非机动车和行人在转角交通岛上的停驻交通量与交通岛容纳能力不匹配是导致交通岛拥堵的根本原因。基于对5个交叉口共计20小时的实地观测数据分析发现慢行交通在交通岛上呈不均匀分布，因此提出对交通岛进行分区，引入分区密度作为关键量化指标；基于Kaplan-Meier生存分析法，确定了不同分区的停放密度临界阈值，进而构建了慢行交通在转角交通岛的溢出概率预测模型；最后，给出了信号交叉口转角交通岛设置条件。

Abstract: Channelized islands are critical traffic-calming facilities at at-grade intersections, yet significant controversy exists regarding their installation criteria and design methodology. The fundamental cause of congestion stems from the mismatch between the dwelling volume of non-motorized traffic (pedestrians/cyclists) and the island accommodation capacity. Field observation data analysis (20 hours across five intersections) revealed a non-uniform spatial distribution of slow-mode traffic on these islands. Consequently, a subzone division framework is proposed, with subzone density introduced as a key performance metric. Using the Kaplan-Meier survival analysis method, critical density thresholds for different zones were determined. This enabled the development of a spillover probability prediction model for non-motorized traffic on channelized islands. Finally, installation criteria for channelized islands at signalized intersections are proposed.