Highlights A criterion for comparing conventional with innovative one- or two-level roundabout intersections is presented. We applied closed-form capacity models and CORINAIR methodology. Annual delays, and CO2, NOx, PM2.5 and PM10 pollutant emissions show different distributions for various types of roundabouts. Estimations of environmental and overall costs for 8 types of roundabouts are evaluated. We identified the roundabout type which best suits each traffic condition.
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 3300veh/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.
Environmental, functional and economic criteria for comparing “target roundabouts” with one- or two-level roundabout intersections
Transportation Research Part D: Transport and Environment ; 34 ; 330-344
2014-01-01
15 pages
Article (Journal)
Electronic Resource
English
Unsignalized Intersections: Roundabouts
Springer Verlag | 2020
|Street intersections -- Roundabouts
Engineering Index Backfile | 1945
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