Deformation guiding system for a road safety device and a road safety device group

A deformation guiding system for a road safety device, which road safety device comprises a frame connected to the road surface and a deformable longitudinal body which comprises a first end fixed to the frame and a second end opposite the first end, in which the deformation guiding system comprises:

• a head fixable to the second end of the deformable body;
• a straight guide rail, which guide rail and the deformable body are reciprocally arranged in such a way as to identify a deforming direction of the deformable body of the road safety device which is parallel to the straight guide rail;
• coupling means fixed to the head for coupling the head to the guide rail so that the head can slide along the guide rail;
• and
• stabilising means fixed to the head for stabilising the head so as to prevent oscillations of the head about the guide rail,
• the coupling means and the stabilising means being reciprocally arranged and conformed so that, in a case of an impact of a vehicle against the head, the head slides along the guide rail without oscillating about the guide rail so as to be able to guide the deformation of the deformable body along the relative deforming direction,
• wherein:
• the guide rail has a double T-shaped transversal section and defines a first cavity and a second cavity;
• and
• the coupling means comprise a first coupling element and a second coupling element conformed such as to insert, respectively, in the first cavity and the second cavity, realising a form coupling between the coupling means and the guide rail.