System for aerodynamically improving a land vehicle, in particular a truck or the like

A system for the aerodynamic improvement of a ground vehicle comprising an outer side body surface of the vehicle and a rear surface in the direction of travel being a deflector, with an inclination towards a longitudinal axis of the vehicle and a series of vortex generators placed on surfaces of the deflectors wherein the deflectors are inclined between 5° to 30° with respect to the outer side body surface of the vehicle, and the vortex generators are arranged on an outer surface of the deflectors at a maximum distance of 250 mm from change in body inclination between the outer side body surface of the vehicle and the rear surface of the vehicle, the vortex generators on the outer side body surface of the vehicle or the vortex generators positioned on the rear surface will have an angle β relative to the longitudinal axis of the vehicle between 2° to 50° and the vortex generators protrude between 1 cm to 15 cm from the deflectors.