THE PRESENT INVENTION PROVIDES IMPROVEMENTS TO A SPACER BLOCK (10) FOR ATTACHING A GUARDRAIL TO A SUPPORT POST. THE SPACER BLOCK (10) INCLUDES A GENERALLY RECTANGULAR BACKING MEMBER (11) HAVING OPPOSED UPPER AND LOWER EDGES (18, 19) AND OPPOSED SIDE EDGES (16, 17), AND SPACED APART SIDE WALLS (12, 13) INWARDLY EXTENDING ALONG EACH OF SAID SIDE EDGES (16, 17), ONE OF THE SIDE WALL (13) BEING AFFIXED TO THE SUPPORT POST AND ANOTHER OF THE SIDE WALL (12) BEING AFFIXED TO THE GUARDRAIL. THE SPACED APART SIDE WALLS (12, 13) HAVE OPPOSING INNER SURFACES (12A, 13A) MOUNTED WITH AT LEAST ONE REINFORCING ELEMENT (15) THAT EXTENDS BETWEEN THE OPPOSING INNER SURFACES (12A 13A) TO STRENGTHEN THE SPACER BLOCK (10) AND THE ENTIRE SPACER BLOCK UNIT (10) IS COVERED WITH MOLTEN RUBBER THAT IS LEFT TO SET AND WHEREBY UPON SETTING A RIGID RUBBER IS CREATED BY COVERING THE ENTIRE SPACER BLOCK SO AS TO PROVIDE A SPACER BLOCK (10) THAT IS RIGID, DURABLE AND ABLE TO WITHSTAND HARSH ENVIRONMENTAL CONDITIONS.
