IN A REAR END COLLISION'ANOTHER CAR HITTING US, WE WERE JUST BEGINNING TO MOVE WHEN THE LIGHT TURNED GREEN, HE WAS COMING BEHIND US AT A HIGH RATE OF SPEED'THE PASSENGER SEAT CAME FORWARD ALMOST THROWING ME INTO THE DASH, THEN FLEW BACKWARDS, COLLAPSING INTO THE SEAT BEHIND IT. I DID NOT KNOW ABOUT THIS BEING A PROBLEM UNTIL I SAW IT ON TV ABOUT CHILD SAFETY IN THE REAR SEAT. IF ANYONE HAD BEEN IN THE SEAT BEHIND ME THEY WOULD HAVE BEEN SERIOUSLY INJURED. SURPRISINGLY, I WAS NOT INJURED. THE CAR WAS TOTALED BECAUSE THE REAR WAS SO DAMAGED IT COULD NOT BE STRAIGHTENED.