INJURED CRACKED A RIB WHEN HE WAS BOUNCED IN HIS SEAT AFTER RUNNING OVER A ROCK WITH HIS HAUL TRUCK. HE WAS HUGGING THE BERM TO STAY CLEAR OF THE EXCAVATOR WHICH HAD BROKEN DOWN ON THE ROAD. H E WAS TRAVELING IN FIRST GEAR AND WAS BELT IN AT THE TIME. HE MAY HAVE BUMPED THE ARMREST WITH HIS SIDE CAUSING THE INJURY.