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Estimating the parameters of Cowan’s M3 headway distribution for roundabout capacity analyses

2012-12-13Journal article Open access
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dc.contributor.authorVasconcelos, Luís
dc.contributor.authorSilva, Ana Bastos
dc.contributor.authorSeco, Álvaro
dc.contributor.authorSilva, João
dc.date.accessioned2025-11-10T17:56:07Z
dc.date.available2025-11-10T17:56:07Z
dc.date.issued2012-12-13
dc.description.abstractCapacity models based on the gap acceptance theory are widely used in unsignalised intersections and roundabout capacity analysis. !ese models are based on the statistical distribution of major vehicle headways. In this "eld, Cowan’s M3 distribution is usually recognized as the most adequate, but the estimation of its parameters is not trivial. In this paper, the main estimation methods are reviewed and a new method (Simultaneous Numerical Estimation – SNE) is proposed. !e SNE method was used to develop a calibrated relation between parameters, using "eld data collected in Portuguese roads and roundabouts. It was determined that the new formula improves capacity estimates, either in one-lane or in two-lane roundabouts. !e paper also addresses the importance of each input variable and parameter in the resulting capacity model, through a sensitivity analyses.eng
dc.description.sponsorshipThis work was supported by FCT (Portugal) in the scope of the R&D project PTDC/SEN-TRA/122114/2010 (AROUND – Novos Instrumentos de Avaliação Operacional e Ambiental de Rotundas).
dc.identifier.citationVasconcelos, L., Silva, A. B., Seco, Álvaro, & Silva, J. (2012). Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses. The Baltic Journal of Road and Bridge Engineering, 7(4), 261-268. https://doi.org/10.3846/bjrbe.2012.35
dc.identifier.doi10.3846/bjrbe.2012.35
dc.identifier.issn1822-427X
dc.identifier.issn1822-4288
dc.identifier.urihttp://hdl.handle.net/10400.8/14579
dc.language.isoeng
dc.peerreviewedyes
dc.publisherRiga Technical University
dc.relationAROUND - Improving Capacity And Emission Models of Roundabouts
dc.relation.ispartofThe Baltic Journal of Road and Bridge Engineering
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectRoundabout
dc.subjectCapacity
dc.subjectCowan M3
dc.subjectStatistical distribution
dc.subjectSensitivity analyses
dc.subjectHeadway
dc.titleEstimating the parameters of Cowan’s M3 headway distribution for roundabout capacity analyseseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAROUND - Improving Capacity And Emission Models of Roundabouts
oaire.awardURIhttp://hdl.handle.net/10400.8/13493
oaire.citation.issue4
oaire.citation.titleThe Baltic Journal of Road and Bridge Engineering
oaire.citation.volume7
oaire.fundingStream5876-PPCDTI
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameCruz da Silva
person.givenNameJoão Pedro
person.identifier.ciencia-id961E-61CC-3A9D
person.identifier.orcid0000-0003-4206-243X
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relation.isAuthorOfPublication.latestForDiscovery46d8dfe0-9d72-49a0-a14f-f27d33f99a0f
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