WHILE STOPPED AT A RED LIGHT I HAD A REAR END COLLISION BY A FORD F250 INTO MY SCION XD THEN KNOCKING ME INTO A TOYOTA VAN IN FRONT OF ME. DRIVERS AIR BAG DEPLOYED. WHEN THE CAR CAME TO A STOP I WENT TO LAY BACK IN MY SEAT AND MY HEAD FELL BACK, THAT IS WHEN I NOTICED THE HEAD REST WAS MISSING. WHEN I LOOKED FOR IT WAS SITTING ON MY DASH. HEAD REST WAS IN LOWEST SETTING BEFORE THE ACCIDENT. *TR