Traffic characteristics and safety analysis of expressway off-ramp junction

doi:10.3785/j.issn.1008-973X.2022.02.019

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (2): 379-387 DOI: 10.3785/j.issn.1008-973X.2022.02.019

Traffic characteristics and safety analysis of expressway off-ramp junction

Yong-heng CHEN1(

),Chang-jian WU1,Qiao-wen BAI1,*(

),Shuai XIONG2,Wan-ning LI1,Hao-nan LI1

1. College of Transportation, Jilin University, Changchun 130022, China
2. North China Municipal Engineering Design and Research Institute Limited Company, Tianjin 300074, China

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Abstract

In order to explore the driving behavior and safety characteristics of the junction between the off-ramp and the downstream intersection, combined with the measured track data of lane changing vehicles, the track characteristics and the lane changing position characteristics of the ramp junction vehicles were analyzed. Using the traffic conflict technology, the risk of vehicle lane changing was analyzed with post encroach time (PET) as the index, and the ordered probability model was established to identify the factors affecting the severity of the conflict. Results show that the Lorentz distribution model can be used to fit the vehicle lane change position. The lane change type and the number of lane crossing have significant effects on the vehicle lane change position, and the lane change position is closer to the beginning of the junction when the lane change is forced and the lane crossing is multi-lane. Compared with the ordinary junction section, the driving risk of the ramp junction section is higher, and the main conflict type is crossover conflict. The saturation of junction section, lane change position, cross conflict, forced lane change and illegal lane change are significantly related to the severity of conflict. The stability of the headways in the off-ramp junction section is poor during the green phase, and the lane changing interference of the queuing vehicle in the interweaving section is serious.

Key words： ramp junction section lane changing characteristic safety analysis traffic conflict statistical analysis

Received: 02 April 2021 Published: 03 March 2022

CLC:

U 491

Corresponding Authors: Qiao-wen BAI E-mail: cyz@jlu.edu.cn;victorbty@foxmail.com

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	Yong-heng CHEN
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	Hao-nan LI

Cite this article:

Yong-heng CHEN,Chang-jian WU,Qiao-wen BAI,Shuai XIONG,Wan-ning LI,Hao-nan LI. Traffic characteristics and safety analysis of expressway off-ramp junction. Journal of ZheJiang University (Engineering Science), 2022, 56(2): 379-387.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.02.019 OR https://www.zjujournals.com/eng/Y2022/V56/I2/379

快速路出口匝道衔接段交通特性与安全分析

为了探究快速路出口匝道与下游交叉口衔接段的驾驶行为与安全特性，结合实测换道车辆轨迹数据，分析匝道衔接段车辆轨迹特性和换道位置特性. 利用交通冲突技术，以后侵入时间（PET）为指标对车辆换道风险展开分析，建立有序概率模型识别冲突严重程度的影响因素. 结果显示，用Lorentz分布模型拟合车辆换道位置效果较好，换道类型与跨越车道数对车辆换道位置有显著影响，在强制换道与跨越多车道时换道位置更靠近衔接段始端；相较于普通衔接段，匝道衔接段行车风险更高，主要冲突类型为交叉冲突；衔接段饱和度、换道位置、交叉冲突、强制换道以及违章换道与冲突严重程度显著相关. 匝道衔接段释放车辆的车头时距稳定性差，交织区排队车辆的释放受换道干扰严重.

关键词： 匝道衔接段, 换道特性, 安全分析, 交通冲突, 统计分析

Fig.1 Geometrical parameters of survey sites

Fig.2 Vehicle trajectories information collection

Fig.3 Trajectories of typical lane changing traffic

Tab.1 Fitting results of lane changing location distribution model

Fig.4 Probability distributions of lane changing positions

Fig.5 Cumulative frequency distribution of lane changing positions within different lane changing types

Tab.2 Statistical analysis of lane changing positions within different lane changing types

Fig.6 Cumulative frequency distribution of lane changing positions within different number of lane crossings

Tab.3 Statistical analysis of lane changing positions within different number of lane crossings

Fig.7 PET histograms and cumulative distribution curve of ramp junction segment

Tab.4 Comparison of traffic conflicts in two junction sections

Tab.5 Calibration of ordered Probit model parameters

Tab.6 Marginal effects of ordered Probit model

Fig.8 Box chart of time headway distribution

Fig.9 Order chart of time headway


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