The road pollutant emissions, above all in urban context, are correlated
to many infrastructural parameters and to traffic intensity and
typology. The research work on road junction geometry, carried out in
European research centres, has recently allowed to design new road
intersection types which are of undoubted interest, especially in terms
of traffic functionality and safety, like the fl ower roundabouts (in
which right-turn manoeuvres do not confl ict with the circulating flow).
The main objective of this paper is to propose a model for the
estimation the capacity, delay, levels of service and the pollutant
emissions into flower roundabouts. A comparative analysis between
conventional roundabout and flower roundabout has been carried out in
terms of CO, CO₂, CH₄, NO, PM₂,₅
and PM10 vehicular emissions, evaluated by mean of COPERT Software which
is developed as a European tool for the calculation of emissions from
the road transport sector.