| 自由流状态的判别标准研究 |
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| 引用本文： | 方靖,荣建,祝站东,周建.自由流状态的判别标准研究[J].中国公路学报,2010(Z2). |
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| 作者姓名： | 方靖 荣建 祝站东 周建 |
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| 作者单位： | 交通运输部公路科学研究院;北京工业大学北京市交通工程重点实验室; |
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| 基金项目： | 国家西部交通建设科技项目(2007 318 223 25,2003 318 490 08) |
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| 摘 要： | 基于运行速度的定义,首先通过现场试验采集了试验车的实时行驶速度,分析了试验车的行驶状态变化情况,基于不同的行驶状态确定了车头时距的变化阈值,然后通过研究典型断面的速度波动规律,分析了不同车头时距下的速度变化特征与分布特征,确定出车头时距为自由流状态的度量指标,并通过统计分析方法,提出了车辆自由行驶状态的判别标准。结果表明:自由流交通状态的车头时距应大于9 s;研究结论为公路运行速度体系的建立奠定了理论基础。
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| 关 键 词： | 交通工程 运行速度 统计分析 自由流 车头时距 速度差 |
Research on Judgment Criterion of Free-flow State |
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| FANG Jing,RONG Jian,ZHU Zhan-dong,ZHOU Jian.Research on Judgment Criterion of Free-flow State[J].China Journal of Highway and Transport,2010(Z2). |
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| Authors: | FANG Jing RONG Jian ZHU Zhan-dong ZHOU Jian |
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| Institution: | FANG Jing~1,RONG Jian~2,ZHU Zhan-dong~2,ZHOU Jian~1 (1.Research Institute of Highway of Ministry of Transport,Beijing 100088,China,2.Beijing Key Laboratory of Transportation Engineering,Beijing University of Technology,Beijing 100124,China) |
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| Abstract: | Based on definition of operating speed,experiment was performed and data of real-time speed of the cars were gathered to analyze the change of continuous speed of the cars and the change of the time headway and the fluctuation rules of the speed differentiae passing through classic transect were studied.Then,the change and distribution characters of speed with time headway were studied,and time headway was regarded as the measurement index of free-flow. The judgment criterion of free-flow speed was drawn us... |
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| Keywords: | traffic engineering operating speed statistical analysis free-flow time headway speed differentia |
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