有限优先下交叉口信号设置的临界流量依据  

Critical traffic volume of traffic signal warrant under limited priority condition

作　　者：马东方[1] 王殿海[1] 杨希锐[2] 陈松[1] 

机构地区：[1]吉林大学交通学院,长春130022 [2]蚌埠汽管理学院,蚌埠233011

出　　处：《东南大学学报（自然科学版）》2010年第4期860-865,共6页Journal of Southeast University：Natural Science Edition

基　　金："十一五"国家科技支撑计划重点资助项目(2006BAJ18B07);国家重点基础研究发展计划(973计划)资助项目(2006CB705505)

摘　　要：为完善交叉口信号设置的临界流量依据,引入支路车辆穿越主路车流的风险时间函数和等待时间函数,从微观角度确定了临界间隙与主路流量函数关系,得到了有限优先现象的主路流量最小阈值为500pcu/h,并推导了有限优先下交叉口车均延误模型.在此基础上,从交通安全和效率的角度出发,确定了支路车辆穿越主路车流的最小临界间隙值为4.5s.对比设置信号前后交叉口车均延误的大小,得到了有限优先下1/1,1/2,2/2相交3种常见交叉方式需设置信号的临界流量曲线.与完全优先的主支路交叉口相比,有限优先下3种交叉方式设置信号的临界流量平均增量分别为20.33%,20.95%,21.43%.研究成果可为信号设置临界流量的确定提供一种新的理论参考.In order to perfect the critical traffic volume of traffic signal warrant,the functional relationship between critical gap and traffic volume of major road is proposed from microscopic angle by introducing time risk model and waiting time model when vehicles on minor road cross the traffic flow of major road.The minimum threshold of major road volume was obtained as 500pcu/h.On this basis, a model of average vehicle delay for unsignalized intersections under limited priority condition was established.Then,from the viewpoint of traffic efficiency and safety,the minimum value of critical gap was established as 4.5s.The critical volume curve of traffic signal warrant of three common cross patterns,i.e.1/1,1/2,2/2 cross,under the limited priority condition was obtained by comparing the average vehicle delays before and after signal control.Comparing to the absolute priority condition,the results show that the average increments of critical volume under the limited priority condition are 20.33%,20.95% and 21.43% respectively.This research may provide a new theory reference for drafting critical traffic volume of traffic signal warrant.

关 键 词：有限优先 信号设置 临界间隙 通行能力 延误 临界流量 

分 类 号：U491[交通运输工程—交通运输规划与管理]