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What characterizes a free vehicle in an urban area?
Swedish National Road and Transport Research Institute.ORCID iD: 0000-0002-1849-9722
2002 (English)In: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517, Vol. 5, no 1, 313-327 p.Article in journal (Refereed) Published
Abstract [en]

The concept "free vehicle" is used widely in the transportation research literature, but as yet there is no common standard for a definition. In this article a standard is provided that is based on the assumption that a vehicle can be considered free, when its speed is not influenced by the speed of the vehicle traveling ahead. In order to determine empirically a threshold for free vehicles in urban areas, speed, distance headway, and time headway data of more than 100 000 vehicles were analyzed. Analyses showed that the speeds of two vehicles are linearly dependent on time headway for headways up to 6 s. It is important to distinguish between this value and the drivers' preferred headway, which is in the region of 2 s

Place, publisher, year, edition, pages
2002. Vol. 5, no 1, 313-327 p.
Keyword [en]
Traffic flow, Speed, Distance (between veh), Headway, Threshold (math)
National Category
Vehicle Engineering
Research subject
20 Road: Traffic engineering, 25 Road: Traffic theory
Identifiers
URN: urn:nbn:se:vti:diva-7914DOI: 10.1016/S1369-8478(02)00003-7ScopusID: 2-s2.0-0036094076OAI: oai:DiVA.org:vti-7914DiVA: diva2:814887
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2016-02-04Bibliographically approved

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Vogel, Katja
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Citation style
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  • de-DE
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  • Other locale
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