信号交叉口左弯待转区的安全研究

发布时间：2018-03-18 01:15

本文选题：左弯待转区　切入点：交通冲突技术　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：近些年,信号交叉口左弯待转区已经在中国许多城市逐渐推广使用。这种交通设计允许左转车辆在本向直行相位时进入交叉口内等待,直到后置左转相位再驶离交叉口。左弯待转区的设置能有效提高交叉口通行能力,减少排队车辆溢出左转车道的概率。但是关于左弯待转区运行的安全性至今仍未开展相关研究。本文首先分析在左弯待转区这种特定的交通组织方式下左转车流具有的交通特性,再基于交通冲突技术展开左弯待转区的安全分析。在比较交通冲突严重程度的两个主要指标：time to collision (TTC)和post-encroachment time (PET)的特点后,本文选用PET值作为指标并将交通冲突分为潜在冲突、轻微冲突与严重冲突。论文研究了各种类型交通冲突的发生机理,对比分析有／无左弯待转区下,交叉口内冲突类型分布的差异性,还建立了ordered probit模型来探索与左转冲突相关的显著影响因素,并计算影响因素对各种等级冲突的边际效应值。研究结果表明,相比无左弯待转区交叉口,左弯待转区交叉口PET值普遍较大,交通运营更为安全,其中左转与对向直行冲突数量与严重程度都明显降低。但是左弯待转区交叉口内的合流冲突比例却明显提高。根据模型回归,左转交通量、车辆是否在待转区外行驶、是否闯红灯、是否存在追尾冲突以及二次冲突等因素显著加剧左弯待转区交通冲突的严重性。论文最后提出左弯待转区安全设置的条件与方法。本文研究的结果将有助于完善现有的左弯待转区设计与管理,提高左弯待转区交叉口运营安全水平。
[Abstract]:In recent years, the left bend waiting area of signalized intersections has been gradually popularized in many cities in China. This traffic design allows left-turn vehicles to enter the intersections and wait when they are in the original direct phase. Until the left turn phase and then leave the intersection. The left bend waiting area can effectively improve the capacity of the intersection, The probability of queue vehicles overflowing left turning lane is reduced. However, the safety of left turning zone has not been studied. This paper first analyzes the left turn traffic flow under the specific traffic organization mode of left turn waiting area. Traffic characteristics, After comparing the characteristics of two main indexes of traffic conflict severity:: time to collision (TTCs) and post-encroachment time (post-encroachment), this paper selects the PET value as the index and classifies traffic conflicts into potential conflicts. This paper studies the mechanism of various types of traffic conflicts and analyzes the differences of conflict types in intersections with or without left bends. The ordered probit model is also established to explore the significant factors related to the left-turn conflict, and to calculate the marginal effects of the factors on the conflicts of various grades. The PET value at the intersection of the left corner waiting for turning area is generally larger, and the traffic operation is more safe. The number and severity of conflict between left turn and opposite direction are obviously decreased. However, the proportion of confluence conflict in the intersection of left turn and turn area is obviously increased. According to the model regression, whether or not the vehicle is driving outside the waiting area, according to the model regression, Whether to run a red light, Whether there is a rear-end conflict or a secondary conflict has significantly aggravated the severity of the traffic conflict in the left turn waiting area. Finally, the paper puts forward the conditions and methods for the safety setting of the left turn waiting area. The results of this paper will be helpful to improve the traffic conflict. The design and management of the existing left bend waiting area, Improve the level of operational safety at the intersection of the left-turn-to-turn area.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U491.23

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