Same-Side Continuous Entrance Spacing on Expressway Mainline Based on Cellular Automata

doi:10.3969/j.issn.1674-0696.2024.07.08

Abstract

Abstract: In response to the issue of vehicle safety and traffic efficiency at continuous entrances on the same side of the mainline of expressways, a study was conducted on the spacing between continuous entrance on the same side of the mainline of expressways. By establishing a cellular automaton simulation model, the difference of design speed of the mainline and ramp was analyzed, and the effect of the length of the continuous entrance spacing between the mainline and ramp on traffic conflict rate, average number of congested vehicles, and average speed on highways was also analyzed. Recommended values of the spacing between continuous ramp entrances on the same side of the mainline under different combinations of mainline and ramp design speeds were proposed. Simulation comparative analysis was carried out on the operating conditions under different spacing combinations. The research findings indicate that when there is a significant difference in design speed of the mainline and ramp, the spacing between continuous entrances on the same side of expressways in current specifications fails to meet the requirements of traffic safety and operational efficiency. Compared to using the general values specified in regulations, the average speed of mainline vehicles increases from 81.39km/h to 95.29km/h, the collision rate of ramp vehicles decreases from 0.0335 times/(km·veh) to 0.025 6 times/(km·veh), and the average congestion of ramp vehicles decreases from 0.0077veh/s to 0.002 2 veh/s, when the recommended values proposed in the text are adopted. Thereby, the vehicle traffic efficiency is enhanced, and the risk of vehicle accidents is reduced.

Key words: traffic engineering; continuous entrance; cellular automata model; expressway; simulation technology

摘要： 针对高速公路主线同侧连续入口处车辆行驶安全与通行效率问题，对高速公路主线同侧连续入口间距进行了研究。通过建立元胞自动机仿真模型，分析了主线与匝道设计速度的差异以及高速公路主线匝道连续入口间距各部分长度对交通冲突率、平均拥堵车辆数和平均速度的影响；提出了不同主线与匝道设计速度组合下的主线同侧连续匝道入口间距推荐值；并对不同间距组合下的工况进行了仿真对比分析。研究结果表明：当主线与匝道设计速度的差异较大时，现有规范中的高速公路主线同侧连续入口间距难以满足交通安全与通行效率要求；相比采用规范中的一般值，采用文中推荐值时的主线车辆平均速度由81.39 km/h上升到95.29 km/h，匝道车辆冲突率由0.033 5次/(km·veh)下降到0.025 6次/(km·veh)，匝道车辆平均拥堵数由0.007 7 veh/s下降到0.002 2 veh/s，提高了车辆通行效率，降低了车辆发生事故的风险。

关键词: 交通工程；连续入口；元胞自动机模型；高速公路；仿真技术

CLC Number:

U491.1

ZHANG Hang1, PENG Xiang1, MA Baolin1, WANG Xingyue1, LYU Nengchao2. Same-Side Continuous Entrance Spacing on Expressway Mainline Based on Cellular Automata[J]. Journal of Chongqing Jiaotong University(Natural Science), 2024, 43(7): 61-69.

张航1，彭翔1，马宝林1，王星月1，吕能超2. 基于元胞自动机的高速公路主线同侧连续入口间距研究[J]. 重庆交通大学学报（自然科学版）, 2024, 43(7): 61-69.

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