01099333

Component

https://doi.org/10.3141/2071-14

http://scholar.google.com...Tian&publication_year=2008

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 at seven single-lane and three multilane roundabouts in California. Results indicate that the mean critical headway is consistent with the values recommended 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 major factors affecting critical headway and follow-up headway. Results from this study enhance the existing database related to drivers’ gap-acceptance behavior at U.S. roundabouts.

01118256

English

pp 117-124

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309113465

Print

Figures (6) ; References (15) ; Tables (8)

Behavior; Gap acceptance; Headways; Roundabouts; Traffic flow rate; Traffic speed

California

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Jan 29 2008 3:30PM

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