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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11923

Title: Analysis of time headways on urban roads: Case study from Riyadh
Authors: Al-Ghamdi, A.S.
Keywords: Engineering controlled terms: Motor transportation; Traffic control; Vehicles
Issue Date: 2001
Publisher: ASCE - American Society of Civil Engineers
Citation: Journal of Transportation Engineering Volume 127, Issue 4, July 2001, Pages 289-294
Abstract: The headway between vehicles in a traffic stream is of fundamental importance in traffic engineering applications. Previous research in this subject has focused on modeling theoretical distributions for low and medium traffic flow conditions. Yet little research has studied congested traffic conditions-that is, the high traffic flow state. In the same context, there appears to be a lack of clear-cut boundaries for the three flow states (low, medium, and high). This study attempts to determine such boundaries on the basis traffic conditions observed at the study sites. Although observed headways at arterial sites follow a gamma distribution, distributions that fit freeway headways differ according to the traffic flow state. The Erlang distribution provided a good fit to the observed headways at sites with high traffic flows.
URI: http://hdl.handle.net/123456789/11923
ISSN: 0733947X
Appears in Collections:College of Engineering

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