Statistical evaluation of slope's effect on real emissions and fuel consumption performed with different cars in Naples urban area

In the field of sustainable mobility emissions values are still remarkable, especially in urban areas, where more than one-half of the world's population now lives. To give a contribution to this issue a research activity was realized within a national scientific project. In this context it was realized the evaluation of the fuel consumption and emissions during the actual use of the vehicle on the road. Tests were carried out with different cars, in order to identify and to describe the most representative road paths of the city of Naples where topography presents significant changes in slope. The emissions and fuel consumption were analyzed according to the shape of the vehicle, the traffic information, the definition of the driving cycles and the characteristics of the path, integrated with the data available through the free cartographies. A particular attention was given to the slope variability along the streets during each journey performed by the instrumented vehicle. Finally the slope analysis can be correlated to the emission and consumption values in a specific road position, and it could be evaluated its influence on their behaviour.