It represents the Environmental Impact Assessment (EIA) of the Project of technical and economic feasibility for a new bridge over the Arno River and the relative mobility for the connection between the junction of the road Firenze-Pisa-Livorno of Lastra a Signa and the SR (Regional Road) 66 “Pistoiese”, functional to the fluidization of this road junction to the northwest of the Florentine plain.