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Environmental,functional and economic criteria for comparing “target roundabouts” with one- or two-level roundabout intersections
Institution:1. School of Rural & Surveying Engineering, Faculty of Engineering, Aristotle University of Thessaloniki, Greece;2. Faculty of Engineering and Architecture, University of Enna KORE, Enna, Italy;1. Dept. of Civil, Environmental and Architectural Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy;2. Istituto Motori of National Research Council (CNR), Viale Marconi 4, 80125 Napoli, Italy
Abstract:The article describes a criterion based on functional, environmental and economic aspects for comparing conventional roundabouts with innovative one- or two-level roundabouts. We compared the performances of eight roundabout types, differing in geometric layout, number of lanes and traffic flow regulation from each other, with regard to vehicle delays and CO2, NOx, PM2.5 and PM10 pollutant emissions. Recently-designed roundabouts – target roundabouts and flyover roundabouts – have also been studied for their undoubted practical interest. By means of closed-form capacity models and CORINAIR methodology, several traffic simulations were carried out to examine a typical annual traffic demand curve in a suburban context, three different distribution test matrices for traffic flows (ρ1, ρ2, ρ3) and maximum annual traffic flow values Qmax ranging between 1300 and 3300 veh/h.Estimating vehicle delays and annual pollutant emissions, along with construction and management costs, allowed obtaining overall costs for each roundabout examined, in function of traffic demand and several other parameters. Thanks to these analyses, we identified the roundabout types which best suit to each traffic condition.
Keywords:Flower roundabout  Target roundabout  Four flyover roundabout  Environmental and economic criteria  Comparative analysis
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