I WAS REAR-ENDED BY A 2002 OFFSET TO DRIVER SIDE OF CAR AT AN ESTIMATED 30-40MPH. DRIVERS SEAT IN ALTIMA IS 8-WAY ELECTRIC AND DURING IMPACT, THE SEAT TILTED BACK ALL THE WAY. THE IMPACT DROVE MY CAR INTO THE BACK OF A 1982 DODGE RAM CHARGER WHICH WAS ALSO OFFSET IMPACT ON FRONT SIMILAR TO REAR. THE DODGE WAS THEN DRIVEN INTO THE BACK OF A SUZUKI GRAND VATARA. I WAS COMPLETELY STOPPED AS WAS THE DODGE IN FRONT OF ME. DURING IMPACT FROM REAR, DRIVER SEATBACK FAILED AND ALLOWED SEAT TO TILT ALL THE WAY BACK AND IT REMAINED THERE. WHEN I IMPACTED THE DODGE IN FRONT OF ME, I SUBMARINE'D UNDER THE SEATBELT UNTIL IT CAUGHT ME IN THE RIBS. MY ALTIMA WAS TOTALED BY INSURANCE. NONE OF THE 6 AIRBAGS IN THE CAR DEPLOYED. I SUSTAINED LOW BACK INJURIES, THAT I FEEL SHOULDN'T HAVE HAPPENED AS A RESULT OF THE SEAT FAILURE. I DID DO SOME DIGGING AROUND AND FOUND THIS ALARMINGLY COMMON. TO ME THIS IS UNACCEPTABLE, FOR IF IMPACT HAD BEEN MORE SEVERE THE CHANCES OF SPINAL INJURY WOULD BE EVEN GREATER.*AK