Vehicle for the transportation of passengers, said vehicle comprising: - at least one operative axle having two opposite ends at each of which at least one outer wheel is arranged, each outer wheel comprising a pneumatic tire supported by a rim which is vertically mounted on a corresponding horizontal hub element, said rim defining a internal cavity of the outer wheel which is open outwards; - at least one energy recovery apparatus, suitable to convert the kinetic energy of a corresponding outer wheel into electric energy, at least energy recovery apparatus is built as an independent unit adapted to be mounted into or removed from said internal cavity of a corresponding wheel from the outside of said wheel wherein said independent unit is mounted on said vehicle via at least two reference points, a first rotatable reference point being formed by said hub element or by said rim of said wheel, and a second non rotatable reference point being formed by a non-rotatable part (31a,32a) of said vehicle wherein said vehicle comprises electrical energy conversion means including: - a moving assembly comprising a rotor unit mechanically and coaxially connected to the corresponding hub element via said first rotatable reference point; - a fixed assembly comprising at least a stator unit which interacts electromagnetically with said rotor unit for converting the kinetic energy of said rotor into electric energy, said fixed assembly being stably connected to a firm part of said vehicle which forms said second non rotatable reference point to maintain a stable position during the rotation of said rotor unit. wherein said fixed assembly comprises a containment element which contains electrical energy storing means in form of electric batteries suitable to store electric energy generated by the interaction of said rotor unit with said stator unit wherein for each end of said operative axle, said vehicle comprises a suspension assembly which includes suspension arms (31,32) and wherein said second non rotatable reference point is defined by a connection (31a,32a) of said independent unit with one of said suspension arms (31,32) of the corresponding suspension assembly characterized in that for each of said ends of said operative axle, said vehicle comprises a suspension assembly which includes a first suspension arm and a second suspension arm and wherein said fixed assembly comprises an outer wall comprising a first lateral extension and a second lateral extension which are mechanically connected respectively to said first suspension arm, by defining said second non rotatable reference point, and to said second suspension arm of said suspension assembly so as to define a third non rotatable reference point. - at least one operative axle having two opposite ends at each of which at least one outer wheel is arranged, each outer wheel comprising a pneumatic tire supported by a rim which is vertically mounted on a corresponding horizontal hub element, said rim defining a internal cavity of the outer wheel which is open outwards; - at least one energy recovery apparatus, suitable to convert the kinetic energy of a corresponding outer wheel into electric energy, at least energy recovery apparatus is built as an independent unit adapted to be mounted into or removed from said internal cavity of a corresponding wheel from the outside of said wheel - a moving assembly comprising a rotor unit mechanically and coaxially connected to the corresponding hub element via said first rotatable reference point; - a fixed assembly comprising at least a stator unit which interacts electromagnetically with said rotor unit for converting the kinetic energy of said rotor into electric energy, said fixed assembly being stably connected to a firm part of said vehicle which forms said second non rotatable reference point to maintain a stable position during the rotation of said rotor unit.