Characteristics of speed dispersion and its relationship to fundamental traffic flow parameters
學年 103
學期 1
出版（發表）日期 2014-08-01
作品名稱 Characteristics of speed dispersion and its relationship to fundamental traffic flow parameters
作品名稱（其他語言）
著者 Chih-Lin Chung; Will W. Recker
單位 運輸管理學系暨研究所
出版者 UK: Routledge
著錄名稱、卷期、頁數 Transportation Planning and Technology 37(7), pp.581-597
摘要 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.
關鍵字 speed dispersion;coefficient of variation of speed;standard deviation of speed;macroscopic traffic flow model
語言 en
ISSN 1029-0354
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者 Chih-Lin Chung
審稿制度 是
國別 CHE
公開徵稿
出版型式 ,電子版,紙本
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