Safety fence for roads

Claim 1

IN A SAFETY FENCE FOR DELINEATING AT LEAST ONE BOUNDARY OF A ROAD AND FOR PREVENTING A COLLIDING AUTOMOBILE FROM ESCAPING THAT BOUNDARY, WHEREIN SAID FENCE HAS A PLURALITY OF POST MEMBERS SPACED IN LINE ALONG SAID ROAD; EACH OF SAID POST MEMBERS COMPRISING AN ELONGATEDD UPPER POST PORTION, A SOCKET MEMBER FIRMLY EMBEDDED IN THE GROUND, AND A SHEAR PIN HAVING ITS LOWER END EMBEDDED IN SAID SOCKET MEMBER AND ITS UPPER END EMBEDDED IN THE LOWER END OF SAID POST PORTION, SAID SHEAR PIN BEING OF MATERIAL WEAKER IN SHEAR THAN THE MATERIAL OF SAID UPPER POST PORTION AND SAID SOCKET MEMBER; SAID POST MEMBERS HAVING ELONGATED CABLE MEANS SECURED THERETO, SAID CABLE MEANS BEING ANCHORED AT OPPOSITE ENDS; AND SAID CABLE MEANS CONSTRAINING THE IMPACT FORCE OF A VEHICLE WHICH COLLIDES WITH SUFFICIENT FORCE TO CAUSE SAID SHEAR PINS TO FAIL, AND REORIENTING THE DIRECTION OF TRAVEL OF SAID VEHICLE THROUGH THE INCREASE OF SLACK CAUSED BY SUCCESSIVE BREAKING OF SAID SHEAR PINS; THE IMPROVEMENT WHEREIN; SIAD SHEAR PINS HAVE AN EFFECTIVE CROSS-SECTIONAL DIMENSION WHICH IS GREATER IN A DIRECTION TRANSVERSELY OF SAID LINE OF POSTS THAN IN THE DIRECTION OF SAID LINE PARALLEL TO POST, WHEREBY THE PINS WILL SHEAR IN THE DIRECTION OF SAID CABLE MEANS BUT WILL STRONGLY RESIST SHEAR FORCES IN A TRANSVERSE DIRECTION.