MY SON WAS INVOLVED IN A 4 CAR ACCIDENT, HE WAS THE THIRD CAR IN THE ACCIDENT. THE FIRST CAR CLAIMS THAT ANOTHER CAR AHEAD OF HER STOPPED SHORT AND TO AVOID HITTING THE CAR SHE SLAMMED ON THE BRAKES CAUSING THE SECOND CAR TO HIT HER IN THE BACK. MY SON COULDN'T STOP IMMEDIATELY SO HE HIT THE SECOND CAR IN THE BACK., THEN THE FOURTH CAR HIT [XXX] ON THE BACK WITH ENOUGH FORCE TO DENT THE WHOLE HOOD AND BROKE THE RADIATOR AND CAVE THE FRONT BUMPER INTO THE MOTOR. THE CAR IS NOT DRIVABLE. MY SON HAD TO GO IN THE AMBULANCE SINCE HIS CHEST WAS HURTING AND HIS NECK GOT STIFF AND SORE THAT HE COULDN'T MOVE IT. HOWEVER I DON'T UNDERSTAND WHY THE AIRBAGS DIDN'T ENGAGE EVEN WHEN MY SONS CAR GOT HIT WITH ENOUGH FORCE TO DENT HIS WHOLE FRONT END. PLEASE ADVICE [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR