Abstract: A system for aerodynamically improving a land vehicle comprising an outer surface of the vehicle and a rear surface in the direction of travel, a deflector, having an inclination with respect to the front surface, and a series of vortex generators which are arranged on the surfaces. The rear surface, deflector, is inclined to the centre of the vehicle by between 5° to 30° with respect to the outer surface of the vehicle, and the vortex generators are arranged on the outer surface at a maximum distance of 250 mm from the change in inclination between the outer surface of the vehicle and the rear surface, wherein the vortex generators, have an inclination (?) in relation to the vehicle longitudinal axis of between 2° to 50° and the vortex generators protrude by between 1 cm to 15 cm in relation to the adjacent surfaces.

Abstract: The invention relates to a system for a land vehicle (100), in particular for a truck or a truck trailer. The system is attached to the lower surface of the vehicle so as to lie opposite the roadway surface at the rear portion of the truck and comprises at least one part which is inclined in the longitudinal direction and extends rearwards in a tapering manner towards the rear part of the vehicle (100). At least one element (2, 12, 22) is arranged between the roadway surface and the inclined wall (3) substantially at the end of the inclined wall (3) after the last axle of the vehicle, wherein the horizontal axis of the at least one element (2, 12, 22) has substantially the same inclination as the inclined wall (3).

Abstract: The invention relates to a system for a land vehicle (100), in particular for a truck or a truck trailer. The system is attached to the lower surface of the vehicle so as to lie opposite the roadway surface at the rear portion of the truck and comprises at least one part which is inclined in the longitudinal direction and extends rearwards in a tapering manner towards the rear part of the vehicle (100). At least one element (2, 12, 22) is arranged between the roadway surface and the inclined wall (3) substantially at the end of the inclined wall (3) after the last axle of the vehicle, wherein the horizontal axis of the at least one element (2, 12, 22) has substantially the same inclination as the inclined wall (3).