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 closedform 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 (1, 2,  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.

Environmental, functional and economic criteria for comparing “target roundabouts” with one- or two-level roundabout intersections / Tollazzi, T; Tesoriere, G; Guerrieri, M; Campisi, T. - In: TRANSPORTATION RESEARCH. PART D, TRANSPORT AND ENVIRONMENT. - ISSN 1361-9209. - 34:(2015), pp. 330-344. [10.1016/j.trd.2014.11.013]

Environmental, functional and economic criteria for comparing “target roundabouts” with one- or two-level roundabout intersections

GUERRIERI M;
2015-01-01

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 closedform 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 (1, 2,  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.
2015
Tollazzi, T; Tesoriere, G; Guerrieri, M; Campisi, T
Environmental, functional and economic criteria for comparing “target roundabouts” with one- or two-level roundabout intersections / Tollazzi, T; Tesoriere, G; Guerrieri, M; Campisi, T. - In: TRANSPORTATION RESEARCH. PART D, TRANSPORT AND ENVIRONMENT. - ISSN 1361-9209. - 34:(2015), pp. 330-344. [10.1016/j.trd.2014.11.013]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/237748
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