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Critical Gap Analysis of Dual Lane Roundabouts
Univ Indonesia, Dept Civil Engn, Kampus Baru UI, Depok 16424, Indonesia..
KTH, School of Architecture and the Built Environment (ABE), Transport and Economics (closed 20110301), Traffic and Logistics (closed 20110301).
2011 (English)In: 6TH INTERNATIONAL SYMPOSIUM ON HIGHWAY CAPACITY AND QUALITY OF SERVICE / [ed] Koutsopoulos, HN Bang, KL, ELSEVIER SCIENCE BV , 2011, Vol. 16, p. 709-717Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2011. Vol. 16, p. 709-717
Series
Procedia Social and Behavioral Sciences, ISSN 1877-0428 ; 16
Keywords [en]
Critical Gap, Roundabout, Capacity, Gap acceptance
National Category
Transport Systems and Logistics
Identifiers
URN: urn:nbn:se:kth:diva-243239DOI: 10.1016/j.sbspro.2011.04.490ISI: 000298556100067Scopus ID: 2-s2.0-79960047843OAI: oai:DiVA.org:kth-243239DiVA, id: diva2:1351150
Conference
6th International Symposium on Highway Capacity and Quality of Service (ISHC), JUN 28-JUL 01, 2011, Stockholm, SWEDEN
Note

QC 20190913

Available from: 2019-09-13 Created: 2019-09-13 Last updated: 2019-09-13

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Koutsopoulos, Haris N.

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  • apa
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