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Characteristics of speed dispersion and its relationship to fundamental traffic flow parameters

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  • Chih-Lin Chung
  • Will W. Recker

Abstract

Speed dispersion is essential for transportation research but inaccessible to certain sensors that simply record density, mean speed, and/or flow. An alternative is to relate speed dispersion with these available parameters. This paper is compiled from nearly a quarter million observations on an urban freeway and a resulting data-set with two speed dispersion measures and the three fundamental parameters. Data are examined individually by lane and aggregately by direction. The first dispersion measure, coefficient of variation of speed, is found to be exponential with density, negative exponential with mean speed, and two-phase linear to flow. These empirical relationships are proven to be general for a variety of coefficient ranges under the above function forms. The second measure, standard deviation of speed, does not present any simple relationships to the fundamental parameters, and its maximum occurs at around a half to two-thirds of the free flow speed. Speed dispersion may be significantly different by lane.

Suggested Citation

  • Chih-Lin Chung & Will W. Recker, 2014. "Characteristics of speed dispersion and its relationship to fundamental traffic flow parameters," Transportation Planning and Technology, Taylor & Francis Journals, vol. 37(7), pages 581-597, October.
    • Handle: RePEc:taf:transp:v:37:y:2014:i:7:p:581-597
    DOI: 10.1080/03081060.2014.921404
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    Cited by:

    1. Minhua Shao & Congcong Xie & Lijun Sun & Xiaomin Wan & Zhang Chen, 2019. "Left-Side On-Ramp Metering for Improving Safety and Efficiency in Underground Expressway Systems," Sustainability, MDPI, vol. 11(12), pages 1-18, June.
    2. Xiaodong Zhang & Jinliang Xu & Qianqian Liang & Fangchen Ma, 2020. "Modeling Impacts of Speed Reduction on Traffic Efficiency on Expressway Uphill Sections," Sustainability, MDPI, vol. 12(2), pages 1-12, January.

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