COWORKER & EE WERE PASSING EACH OTHER ON HAUL ROAD, EE WAS EMPTY & COWORKER WAS LOADED, ROCKS CAME OFF COWORKER'S TRUCK & BOUNCED OFF THE TIRES & HIT EE'S WINDSHIELD CAUSING IT TO SHATTER. EE HAD A FEW GLASS SPLINTERS IN HIS RT EYE. ANOTHER COWORKER TOOK HIM TO ER. GLASS SPLINTERS REMOVED & EE REC'D TETANUS SHOT & ANTIOBIOTIC EYE DROPS, RELEASED TO FULL DUTY NEXT DAY. FOLLOW UP APP