摘要
为了更好地掌握城市快速路交通流的运行规律,以北京西三环和洛杉矶I405两条交通廊道为研究对象,收集路段检测器数据,通过对交通流数据使用时序分析和交通流模型拟合方法,从时间-空间及交通流原理上分析交通流的时空特性和拥堵基本规律,并用模型拟合方法对道路交通流速度-流量-密度进行分析,获得道路运行状态的关键参数。结果表明:北京西三环廊道与洛杉矶I405廊道自由流速度基本一致,但发生拥堵时的临界速度差值较大,分别为29 km/h和44 km/h;北京西三环交通瓶颈处的实际通行能力明显低于洛杉矶I405交通瓶颈,实际通行能力分别为1245 veh/h/ln和1464 veh/h/ln,差值为219 veh/h/ln。选定Pipes、Van Aerde和S3交通流模型并对模型进一步推导得到通行能力计算公式,利用实测数据对交通流模型进行拟合,并对三种交通流模型的使用范围进行对比分析,结果表明:S3模型较其他两种模型的拟合效果较好,此外,Van Aerde模型也适用于描述北京西三环交通流运行特征。可见,所提出的基于模型拟合的城市快速路交通流运行特征分析方法能够掌握城市快速路运行规律,提取交通流运行的关键参数指标,适用于城市快速路拥堵交通流运行特性分析,具有普适性。
In order to better grasp the running law of urban expressway traffic flow,taking two traffic corridors,Beijing West Third Road and Los Angeles I405 as the research object,two-section of detector data collection,by using time series analysis of traffic flow data,traffic flow model-fitting methods,such as traffic flow in time and space of time-varying characteristics and spatial characteristics of law,the speed-flow-density of road traffic flow was analyzed by model fitting method,and the critical parameters of road running state were obtained.The results show that the free flow velocity of the West Third Ring Road Corridor in Beijing is the same as that of the I405 corridor in Los Angeles.Still,the critical velocity difference is significant when congestion occurs at 29 km/h and 44 km/h.The actual capacity at the bottleneck of the West Third Ring Road in Beijing is significantly lower than that of the I405 bottleneck in Los Angeles,and the actual capacity is 1245 veh/h/ln and 1464 veh/h/ln,respectively,with a difference of 219 veh/h/ln.The measured data were fitted according to the traffic flow model,and the application range of Pipes,Van Aerde and S3 was compared and analyzed.The results show that the fitting effect of S3 model is better than the other two models.In addition,the Van Aerde model is also suitable for describing the traffic flow characteristics of the West Third Ring Road in Beijing.It can be seen that the proposed method based on model fitting can master the operation rules of urban expressway and extract the key parameters of traffic flow operation,which is applicable to the analysis of operation characteristics of urban expressway traffic flow and has universal applicability.
作者
潘芋燕
郭继孚
陈艳艳
谢君鸿
PAN Yu-yan;GUO Ji-fu;CHEN Yan-yan;XIE Jun-hong(Department of Urban Construction,Beijing University of Technology,Beijing 100124,China;Beijing Transport Institute,Beijing 100073,China)
出处
《科学技术与工程》
北大核心
2022年第36期16238-16245,共8页
Science Technology and Engineering
基金
国家重点研发计划(2018YFB1600700)。
