Capacity of normal and turbo-roundabouts: comparative analysis

Detalhes bibliográficos
Autor(a) principal: Vasconcelos, Luís
Data de Publicação: 2012
Outros Autores: Silva, Ana Bastos, Seco, Álvaro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.19/1244
Resumo: While researchers agree as to the safety benefits of turbo roundabouts, their improvements in terms of capacity and delay remain open to discussion. This is mostly because previous research is based on capacity models that do not fully describe the complex interactions between the traffic streams on multilane roundabouts. This paper proposes a procedure to calculate capacity based on gap-acceptance theory. It addresses the limitations mentioned by accounting for usually disregarded effects such as the dynamic choice of the entry lane and unequal allocation of traffic in the circulatory lanes. Capacities were calculated for a wide range of demand scenarios and it has been shown that only under demand scenarios that are very specific and uncommon in real world networks, associated with very high percentages of rightturning entry traffic, can a standard turbo roundabout be expected to provide more capacity than the equivalent two-lane roundabout. It has also been shown that two lane roundabouts can normally be expected to provide capacities 20 to 30% above those of comparable turbo roundabouts.
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spelling Capacity of normal and turbo-roundabouts: comparative analysisTurbo-roundaboutHagringGap-acceptanceWhile researchers agree as to the safety benefits of turbo roundabouts, their improvements in terms of capacity and delay remain open to discussion. This is mostly because previous research is based on capacity models that do not fully describe the complex interactions between the traffic streams on multilane roundabouts. This paper proposes a procedure to calculate capacity based on gap-acceptance theory. It addresses the limitations mentioned by accounting for usually disregarded effects such as the dynamic choice of the entry lane and unequal allocation of traffic in the circulatory lanes. Capacities were calculated for a wide range of demand scenarios and it has been shown that only under demand scenarios that are very specific and uncommon in real world networks, associated with very high percentages of rightturning entry traffic, can a standard turbo roundabout be expected to provide more capacity than the equivalent two-lane roundabout. It has also been shown that two lane roundabouts can normally be expected to provide capacities 20 to 30% above those of comparable turbo roundabouts.ICE - Institution of Civil EngineersRepositório Científico do Instituto Politécnico de ViseuVasconcelos, LuísSilva, Ana BastosSeco, Álvaro2012-11-07T12:00:33Z2012-112012-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.19/1244enghttp://dx.doi.org/10.1680/tran.12.00003info: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:RCAAP2023-01-16T15:24:42Zoai:repositorio.ipv.pt:10400.19/1244Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:40:35.164983Repositório 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 Capacity of normal and turbo-roundabouts: comparative analysis
title Capacity of normal and turbo-roundabouts: comparative analysis
spellingShingle Capacity of normal and turbo-roundabouts: comparative analysis
Vasconcelos, Luís
Turbo-roundabout
Hagring
Gap-acceptance
title_short Capacity of normal and turbo-roundabouts: comparative analysis
title_full Capacity of normal and turbo-roundabouts: comparative analysis
title_fullStr Capacity of normal and turbo-roundabouts: comparative analysis
title_full_unstemmed Capacity of normal and turbo-roundabouts: comparative analysis
title_sort Capacity of normal and turbo-roundabouts: comparative analysis
author Vasconcelos, Luís
author_facet Vasconcelos, Luís
Silva, Ana Bastos
Seco, Álvaro
author_role author
author2 Silva, Ana Bastos
Seco, Álvaro
author2_role 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
dc.subject.por.fl_str_mv Turbo-roundabout
Hagring
Gap-acceptance
topic Turbo-roundabout
Hagring
Gap-acceptance
description While researchers agree as to the safety benefits of turbo roundabouts, their improvements in terms of capacity and delay remain open to discussion. This is mostly because previous research is based on capacity models that do not fully describe the complex interactions between the traffic streams on multilane roundabouts. This paper proposes a procedure to calculate capacity based on gap-acceptance theory. It addresses the limitations mentioned by accounting for usually disregarded effects such as the dynamic choice of the entry lane and unequal allocation of traffic in the circulatory lanes. Capacities were calculated for a wide range of demand scenarios and it has been shown that only under demand scenarios that are very specific and uncommon in real world networks, associated with very high percentages of rightturning entry traffic, can a standard turbo roundabout be expected to provide more capacity than the equivalent two-lane roundabout. It has also been shown that two lane roundabouts can normally be expected to provide capacities 20 to 30% above those of comparable turbo roundabouts.
publishDate 2012
dc.date.none.fl_str_mv 2012-11-07T12:00:33Z
2012-11
2012-11-01T00:00:00Z
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dc.publisher.none.fl_str_mv ICE - Institution of Civil Engineers
publisher.none.fl_str_mv ICE - Institution of Civil Engineers
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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