Driver Behavior and Gap-Acceptance Characteristics at Roundabouts in California.

Author(s)
Xu, F. & Tian, Z.Z.
Year
Abstract

Critical headway and follow-up headway are two important parameters to perform design and operational analyses at a roundabout. This paper addresses drivers' gap-acceptance behavior characteristics at roundabouts and presents the results of critical headway and follow-up headway measurements atseven single-lane and three multi-lane roundabouts in California. The results indicate that the mean critical headway is consistent with the valuesrecommended by the newly completed research NCHRP 3-65; however, the follow-up headway is significantly lower than that recommended by NCHRP 3-65. This paper also reveals that circulating flow rate and speed are two majorfactors affecting critical headway and follow-up headway. The results from this study enhance the existing database related to drivers' gap-acceptance behavior at U.S. roundabouts.

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Publication

Library number
C 45310 (In: C 43862 CD-ROM) /73 / ITRD E844768
Source

In: Compendium of papers CD-ROM 87th Annual Meeting of the Transportation Research Board TRB, Washington, D.C., January 13-17, 2008, 18 p.

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This publication is one of our other publications, and part of our extensive collection of road safety literature, that also includes the SWOV publications.