Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , |
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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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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7160 |
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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 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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 |
institution |
RCAAP |
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 |
repository.mail.fl_str_mv |
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1799130872038817792 |