• Title/Summary/Keyword: 교통행태

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A Microscopic Analysis on the Shapes of Fundamental Diagram Using Time Gap (차간시간(Time Gap) 변수를 이용한 교통기본도(Fundamental Diagram)의 미시적 해석)

  • Kim, Tae-Wan;Kim, Sang-Gu;Kim, Young-Ho;Son, Young-Tae
    • Journal of Korean Society of Transportation
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    • v.22 no.3 s.74
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    • pp.95-105
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    • 2004

  • The fundamental diagram is a important element in a variety of transportation studies. While various shapes of the fundamental diagram have been proposed and numerous debates on the best-fit fundamental diagram have been made, the reason why the fundamental diagram has many different shapes has not been well explained. This study introduces time sap as a key parameter to understand drivers' behavioral differences at different locations and traffic conditions, then relate to the shape of the fundamental diagram. From the freeway event detector data, it is shown that time gap follows a certain probabilistic distribution and its mean value varies along locations. It also turns out that drivers take different time gaps for different travel speeds. Three different types of time gap-speed diagrams are identified and matched to Greenberg, reversed-lambda, and inverted-V types of fundamental diagrams, respectively. This study explains the characteristics of fundamental diagrams using time gap as a microscopic variable and describes drivers' behavioral characteristics according to traffic and geometric conditions.

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