that is to say in such a way that the bottom protuberance 22 is presented as advanced part according to the impact direction the horizontal continuity between screens 4 is achieved by means of partial overlapping between every two consecutive screens at their ends and screwed joints obtained by means of multiple screw washer nut assemblies that successively penetrate corresponding holes 11 two by two at each end of each screen 4 in the overlapping metallic arms 5 and 6 of the system assembled on safety barriers applicable as protection for motorcyclists that are the object of this description are constituted by a metallic flat bar of constant width configurated in the shape of a vertical laid down u201c omega u201d that attaches screen 4 to railing 1 the screen 4 being kept suspended as regards railing 1 the arm constitutes the intermediate connection element between the metallic barrier specifically railing 1 and screen 4 and additionally provides the mechanism for the deformation in case of impact of a motorcyclist against screen 4 the system that is the object of the present description includes two types of arms i support arm 5 this is the support part that connects screen 4 with railing.