Critical Gap Analysis of Dual Lane Roundabouts

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MARC

Kusuma, AndykaUniv Indonesia, Dept Civil Engn, Kampus Baru UI, Depok 16424, Indonesia. (author)

Critical Gap Analysis of Dual Lane Roundabouts

Article/chapterEnglish2011

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Elsevier BV,2011
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LIBRIS-ID:oai:DiVA.org:kth-243239
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-243239URI
https://doi.org/10.1016/j.sbspro.2011.04.490DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:kon swepub-publicationtype

Notes

QC 20190913
Roundabouts are increasingly popular because of their performance in terms of safety, capacity, and cost. Roundabouts have the potential to reduce accident risk since the traffic flows merge and diverge at small angles, and low speeds. Under certain conditions, roundabouts also improve the flow of traffic at the intersection, compared to other choices. In this paper we present a methodology for estimating an important input in the calculation of the capacity of roundabouts: the critical gap. The critical gap is the smallest gap that a driver is willing to accept to merge with the circulating traffic and mainly determines the gap acceptance behavior of the driver. The critical gap is not directly observable. Only gaps that drivers have accepted or rejected are observed. These gaps define upper and lower values for the underlying critical gap but not its exact value. The paper builds on previous literature proposing a rigorous statistical methodology for the estimation of the critical gap, and demonstrates its application through field measurements. It is assumed that the critical gap has a lognormal distribution among the driver population with a mean value that is a function of a number of explanatory variables. Based on these assumptions the critical gap and its distribution can then be estimated using maximum likelihood. A case study in a dual lane roundabout in Stockholm is used to illustrate the proposed methodology using video and other data. The results show that the critical gap depends, among other factors, on the target lane (near or far), the type of the vehicle. The results are aslo compared to values recommended by other studies.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Transportteknik och logistik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Transport Systems and Logistics hsv//eng
TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Infrastrukturteknik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Infrastructure Engineering hsv//eng
Critical Gap
Roundabout
Capacity
Gap acceptance

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Koutsopoulos, Haris N.KTH,Trafik och Logistik(Swepub:kth)u1wuwomo (author)
Univ Indonesia, Dept Civil Engn, Kampus Baru UI, Depok 16424, Indonesia.Trafik och Logistik (creator_code:org_t)

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In:6th international symposium on highway capacity and quality of service: Elsevier BV, s. 709-717

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