Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses

Detalhes bibliográficos
Autor(a) principal: Vasconcelos, Luís
Data de Publicação: 2012
Outros Autores: Silva, Ana Bastos, Seco, Álvaro, Silva, João Pedro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.19/1285
Resumo: Capacity models based on the gap acceptance theory are widely used in unsignalised intersections and roundabout capacity analysis. These models are based on the statistical distribution of major vehicle headways. In this field, 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. The SNE method was used to develop a calibrated relation between parameters, using field 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. The paper also addresses the importance of each input variable and parameter in the resulting capacity model, through a sensitivity analyses.
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spelling Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity AnalysesroundaboutcapacityCowan M3statistical distributionsensitivity analysesheadwayCapacity models based on the gap acceptance theory are widely used in unsignalised intersections and roundabout capacity analysis. These models are based on the statistical distribution of major vehicle headways. In this field, 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. The SNE method was used to develop a calibrated relation between parameters, using field 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. The paper also addresses the importance of each input variable and parameter in the resulting capacity model, through a sensitivity analyses.FCT - Projeto AROUNDThe Baltic Journal of Road and Bridge EngineeringRepositório Científico do Instituto Politécnico de ViseuVasconcelos, LuísSilva, Ana BastosSeco, ÁlvaroSilva, João Pedro2013-01-04T14:41:23Z2012-122012-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.19/1285eng1822-427Xinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-01-16T15:24:49Zoai:repositorio.ipv.pt:10400.19/1285Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:40:41.722314Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
title Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
spellingShingle Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
Vasconcelos, Luís
roundabout
capacity
Cowan M3
statistical distribution
sensitivity analyses
headway
title_short Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
title_full Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
title_fullStr Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
title_full_unstemmed Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
title_sort Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
author Vasconcelos, Luís
author_facet Vasconcelos, Luís
Silva, Ana Bastos
Seco, Álvaro
Silva, João Pedro
author_role author
author2 Silva, Ana Bastos
Seco, Álvaro
Silva, João Pedro
author2_role author
author
author
dc.contributor.none.fl_str_mv Repositório Científico do Instituto Politécnico de Viseu
dc.contributor.author.fl_str_mv Vasconcelos, Luís
Silva, Ana Bastos
Seco, Álvaro
Silva, João Pedro
dc.subject.por.fl_str_mv roundabout
capacity
Cowan M3
statistical distribution
sensitivity analyses
headway
topic roundabout
capacity
Cowan M3
statistical distribution
sensitivity analyses
headway
description Capacity models based on the gap acceptance theory are widely used in unsignalised intersections and roundabout capacity analysis. These models are based on the statistical distribution of major vehicle headways. In this field, 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. The SNE method was used to develop a calibrated relation between parameters, using field 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. The paper also addresses the importance of each input variable and parameter in the resulting capacity model, through a sensitivity analyses.
publishDate 2012
dc.date.none.fl_str_mv 2012-12
2012-12-01T00:00:00Z
2013-01-04T14:41:23Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.19/1285
url http://hdl.handle.net/10400.19/1285
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1822-427X
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eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv The Baltic Journal of Road and Bridge Engineering
publisher.none.fl_str_mv The Baltic Journal of Road and Bridge Engineering
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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