The present invention relates to a module for a road safety barrier (11) comprising essentially a main protection body (12) adapted to be coupled and constrained to at least two support uprights (13) fixed and constrained to the road surface or in the ground immediately adjacent to said road surface, in which said main protection body (12) has an upturned L shaped section to be arranged on said uprights (13) and fixed to them and in which said main protection body (12) has, in its front surface facing outwards, opposite to that facing said uprights (13), at least two wave-shaped enlargements (14) which proceed horizontally and parallel to the ground, said main protection body (12) being made from a special composite material, in which the matrix used for its realisation comes from raw materials recycled from used tyres, that is from the mixing of rubber powder and/or granules containing other recycled plastic materials and their related binders.