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Driving around turbo-roundabouts vs. conventional roundabouts: Are there advantages regarding pollutant emissions?

2016-04-08Journal article Restricted access
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dc.contributor.authorFernandes, Paulo
dc.contributor.authorPereira, S. R.
dc.contributor.authorBandeira, J. M.
dc.contributor.authorVasconcelos, Luís
dc.contributor.authorBastos Silva, Ana
dc.date.accessioned2016-04-13T10:58:10Z
dc.date.available2016-04-13T10:58:10Z
dc.date.issued2016-04-08
dc.description.abstractThis paper addresses the impact of turbo-roundabouts located in urban areas on pollutant emissions using field measurements of vehicle activity data and road congestion levels. The research also compares the emissions of vehicles moving along a turbo-roundabout and a conventional multi-lane roundabout. Based on field measurements taken at turbo-roundabouts without curb dividers located in Grado (Spain) and multi-lane roundabouts in Aveiro (Portugal), three representative speed profiles for each speed trajectory were identified: no stop (I), stop once (II), and multiple stops (III). This study also develops discrete models for turbo-roundabouts and multi-lane roundabouts in which the relative occurrence of those speed profiles is expressed as a function of the entry and conflicting traffic flows. The Vehicle Specific Power (VSP) methodology is then employed to estimate second-by-second pollutant emissions. This study tests the hypotheses that emissions are impacted by the differences in: 1) the characteristics of speed profiles in each movement; 2) the volumes of entry and conflicting flows; 3) the overall saturation level; and 4) the transportation facility considered (turbo-roundabout /multi-lane roundabout). Considering the selected case studies and traffic demands, vehicles at turbo-roundabouts generated more emissions (15-22%, depending on the pollutant) than multi-lane conventional roundabouts, especially under medium and high congested levels. These findings suggest that there are no advantages in implementing turbo-roundabouts from an environmental point of view, even in no saturated conditions.pt_PT
dc.identifier.citationP. Fernandes, S. R. Pereira, J. M. Bandeira, L. Vasconcelos, A. Bastos Silva & M. C. Coelho (2016): Driving around turbo-roundabouts vs. conventional roundabouts: Are there advantages regarding pollutant emissions?, International Journal of Sustainable Transportation, DOI: 10.1080/15568318.2016.1168497pt_PT
dc.identifier.doi10.1080/15568318.2016.1168497pt_PT
dc.identifier.issn1556-8334
dc.identifier.issn1556-8318
dc.identifier.urihttp://hdl.handle.net/10400.19/3157
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherTaylor & Francispt_PT
dc.relation.publisherversionhttp://dx.doi.org/10.1080/15568318.2016.1168497pt_PT
dc.subjectTurbo-roundaboutspt_PT
dc.subjectMulti-lane roundaboutspt_PT
dc.subjectSpeed Profilespt_PT
dc.subjectDiscrete Modelspt_PT
dc.subjectEmissionspt_PT
dc.titleDriving around turbo-roundabouts vs. conventional roundabouts: Are there advantages regarding pollutant emissions?pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleInternational Journal of Sustainable Transportationpt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT

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