判定跟驰状态的研究  

Study on Car-following Behavior Recognition

作　　者：何民[1] 荣建[1] 任福田[1] 

机构地区：[1]北京工业大学交通工程研究所,北京100022

出　　处：《公路交通科技》2001年第4期74-78,共5页Journal of Highway and Transportation Research and Development

基　　金：国家"九五"重点科技攻关项目 (95 40 3 0 2 ); 北京工业大学博士启动基金资助

摘　　要：在大量实际观测交通流数据的基础上 ,深入分析跟驰车辆运行特性与车头时距的关系 ,提出利用相对速度绝对值随车头时距变化的规律定量地判定车辆行驶状态的新方法 ,即利用坐标变换确定车辆跟驰状态与自由行驶状态转折点。通过大量实测数据对该方法的验证表明 ,车头时距低于 5s的车辆处于跟驰状态 ,而大于 8s的车辆处于自由行驶状态 ;同时 ,车速对跟驰状态的界限没有显著影响。Based on more than 180, 000 field data collected at GuangFuo and JingShi expressway, the relationship between the performance characteristics of car-following and time headway is analyzed in detail. A new quantitative methodology is provided for recognizing car-following status on the basis of the variational law between the absolute value of relative speed difference and the time headway. A coordinate transformation method is devised to identify the inflection from the car-following status to the free drive status. Through the verification of the field data, the conclusion was drawn that: 1) The vehicle with headway less than 5s should be recognized as a following car. 2) The vehicle with headway more than 8s should be recognized as a free car. 3) Travel speed has no obvious effects on the threshold values from the car-following status to the free flow status.

关 键 词：跟驰状态 阈值 坐标变换 相对速度 车头时距 交通流 

分 类 号：U491.112[交通运输工程—交通运输规划与管理]