The project of boosting the Florence segment of the main Italian highway, linking the northern regions with the southern ones, has been evaluated in this work, by means of Life Cycle Assessment. Basically, the project consists in building a third lane, for both north and south directions, for the highway segment which bypasses the Florence urban area. This route - 22,5 km long between the two outermost Florence highway exits - is intensively used also as an alternative local traffic way in spite of urban area crossing. Because of the large traffic flows, slowing-downs and jams are frequently reported, especially during rush hours. Beyond annoyances as comfort reduction, time wastes, and noises, this situation strongly contributes to environmental quality reduction in the suburban area, in the highway neighbourhoods. The present situation and the future scenario of third lane addition have been compared in terms of environmental effects on a life cycle horizon. Moreover, further hypotheses of lane widening were proposed and assessed and an improvement in the vehicle composition - considering low emission vehicles, according to the latest EC directives - was evaluated. Results showed that the third-lane project realisation allows 3l% overall environmental load reduction with respect to the present situation scenario. The environmental impact due to the construction and maintenance phases is negligible when compared with the operation phase. The proposed theoretical further lane widening doesn't add any substantial environmental load variation. When also considering vehicle composition improvement, the third-lane scenario results even in higher environmental load percentage reduction with respect to the present situation scenario. For the covering abstract see ITRD E120462.
Samenvatting