首页|疏港道路交叉口客货分道信号控制优化方法

疏港道路交叉口客货分道信号控制优化方法

扫码查看
在疏港道路,常以大型集疏运货车作为主要交通流.由于货车具有总重大、速度低、视野盲区大等特点,会降低交叉口的运行效率,并带来较大的安全隐患.为提高交叉口的安全性和通行效率,设计了交叉口的客货分道布局方案与精细的相位方案,以左转直行冲突量与客货车车均延误为目标建立非线性整数规划模型,并设计相应的遗传算法求解.在建模时,为了充分体现车种的影响,以veh·h-1作为客货车流量的单位.选取上海自贸试验区临港新片区内的同顺大道与康翔路交叉口作为研究对象,将现状方案与优化后的客货混行方案、客货分道方案进行对比.计算结果表明:客货分道方案既有效减少了左转直行冲突,又兼顾优化了延误,相比于未优化的初始客货混行方案,左转直行冲突量减少了 5.14次·h-1,客车延误降低了 27.5 s,货车延误降低了 29.6 s.进一步研究了左转直行冲突量、客车延误与货车延误3个指标的权重取值对所设计的客货分道方案的影响,发现当冲突量权重取值在区间[0.2,0.4],且客货延误权重之比为2:5时,客货分道方案的表现较优.另外研究了不同客货比例对优化结果的影响,发现随着货车比例的提高,左转直行冲突量不断下降,且客货车均延误先增加后趋于平稳.所建立的方法可以有效提高疏港道路交叉口的通行效率与安全性,并做到二者的平衡.
Signal Optimization Method for Car-and Truck-separation Management at Intersections on Port Access Roads
Container trucks are common on port access roads;they are heavy,slow,and have a long braking distance.Container trucks at a high quantity reduces the operational efficiency at signalized intersections on port access roads and causes greater security risks.To improve both traffic safety and efficiency at signalized intersections,this study redesigns the intersection layout and the corresponding signal phase scheme to accommodate car-and truck-separation.A nonlinear integer programming model is established to reduce the number of left-through collisions and the average delay of both cars and trucks,and a corresponding genetic algorithm is designed to solve the model.To fully consider the effect of vehicle type,"vehicle per hour"is used as the unit of truck flow.An intersection on a port access road in the Lingang New Area within the Shanghai Pilot Free Trade Zone is selected to validate the method,and the current scheme is compared with the optimized mixed car-truck and car-and truck-separation schemes.The results show that the car-and truck-separation scheme not only effectively reduces left-through conflicts but also decreases the average delay of cars and trucks.Compared with the current scheme,the optimized scheme reduces the number of left-through conflicts by 5.14 times·h-1,the average car delay by 27.5 s,and the average truck delay by 29.6 s.Additionally,the effect of the weights of three objectives on the car-and truck-separation scheme is investigated.The results show that when the weight of the number of collisions is in the interval of[0.2,0.4]and the ratio of car to truck delay weights is 2∶5,the car-and truck-separation scheme performed better.Additionally,the effect of the car-to-truck volume proportion on the car-and truck-separation scheme is investigated.The results show that the average numbers of cars and trucks first increased and then stabilized,whereas the number of left-through conflicts decreased with the number of trucks.The proposed method can effectively improve and balance the traffic efficiency and safety at signalized intersections on port access roads.

traffic engineeringtraffic signal controlcar-and truck-separationport access roadleft-through conflictdelay

高云峰、罗昊涵、石伟宏、张浩、孙科

展开 >

上海海事大学交通运输学院,上海 201306

交通工程 交通信号控制 客货分道 疏港道路 左转直行冲突 延误

国家自然科学基金

71971136

2024

中国公路学报
中国公路学会

中国公路学报

CSTPCD北大核心
影响因子:1.607
ISSN:1001-7372
年,卷(期):2024.37(8)
  • 12