3RD ROW SEAT BELTS DO NOT LOCK IN A ACCIDENT. I WAS REAR ENDED AND HAD 2 BOOSTER SEATS WITH GRANDKIDS IN THEM. THE LAP PORTION LOCKED BUT THE SHOULDER BELTS DID NOT LOCK IN THE ACCIDENT. THIS IS VERY UNSAFE ESPECIALLY FOR CHILDREN. WE WERE ON A BUSY STREET IN OMAHA, NE WHEN THE ACCIDENT HAPPENED. HIT FROM THE REAR AT ABOUT 35 MILES PER HOUR OR MORE. ALSO, MY AIR BAG DID NOT DEPLOY AFTER I WAS HIT FROM THE REAR, MY CAR HIT THE PERSON IN FRONT OF ME.