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1. A road safety barrier comprising a series of prefabricated concrete parts, of constant cross-section, facing each other at their longitudinal ends, which include: bottom parts (1), forming a barrier base, and top parts (2), forming a barrier body, supported and coupled on the bottom parts (1); characterised in that the bottom parts (1) have an upper surface provided with a longitudinal channel (11) for coupling in the longitudinal direction and with the possibility of limited vertical displacement of a longitudinal extension (21) protruding from a lower surface of the top parts (2); said longitudinal channel (11) of the bottom part (1) and said longitudinal extension (21) of the top part (2) having similar cross-sections, and with calculated dimensional differences so that, in the event of an impact of a vehicle, the top part maintains its integrity and performs, with respect to the vertical median plane (p) of the bottom part (1), a lateral rotation of an amplitude determined and limited by the coupling means of the top and bottom parts, the coupling means comprising the longitudinal channel (11) of the bottom part (1) and the longitudinal extension (21) of the top part (2); the longitudinal channel (11) and the longitudinal extension (21) each comprise at least: an upper segment (a) of decreasing overall width towards a lower area, and a lower segment (b) of a width between the greater width and the lesser width of the upper segment (a).
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