Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.19/1603
Título: Comparison of procedures to estimate critical headways at roundabouts
Autor: Vasconcelos, Luís
Seco, Álvaro
Silva, Ana Bastos
Palavras-chave: roundabout
critical headway
follow-up time
capacity estimation
gap acceptance
Data: 2013
Editora: Promet – Traffic&Transportation
Relatório da Série N.º: ;1
Resumo: The capacity analysis of roundabouts in Portugal is mostly done using the UK regression method. Due to its empirical and non-explanatory nature, this method has some limitations, particularly for studying innovative layouts, which has recently motivated research in Portugal into the use of capacity methods based on gap-acceptance theory. This paper describes the results of a related project: the estimation of critical headways and follow-up times at Portuguese roundabouts. For this study, gap-acceptance data were collected at six roundabouts, in two cities, and used to estimate the parameters at each entry, for the left and right entry lanes independently. Several estimation methods were used (Siegloch, Raff, Wu, Maximum Likelihood and Logit). The results have revealed important specificities of the methods that have significant effects on the results and therefore on the capacity estimate exercises. The comparison of the estimates with reference values from several countries indicates significant differences, suggesting the existence of relevant driving style differences, which implies that locally calibrated, country-specific, parameters are required for capacity calculations.
Peer review: yes
URI: http://hdl.handle.net/10400.19/1603
ISSN: 1848-4069
Versão do Editor: http://www.fpz.unizg.hr/traffic/index.php/PROMTT/article/view/1246
Aparece nas colecções:ESTGV - DEC - Artigos publicados em revista científica

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