THE LEFT REAR TIRE TREAD SEPARATED FROM THE BODY OF THE TIRE WHICH CAUSED THE DRIVER TO LOOSE CONTROL, THE DRIVER STEERED BACK LEFT PARTIALLY INTO THE LEFT LANE THEN BACK TO THE RIGHT, AT THIS POINT THE VEHICLE SPUN PARTIALLY CLOCKWISE OFF ROADWAY THEN ROLLED OVER ONTO IT'S TOP AND A GUARDRAIL, TRAVELED OVER THE GUARDRAIL TO FINAL REST ON ITS ROOF, ONE PASSENGER WAS KILLED FOUR OTHER SUSTAINED INCAPACITATING INJURIES(FLORIDA TRAFFIC CRASH REPORT, BRIDGESTONE/FIRESTONE, P235/75R15, RADIAL ATX M/S, VDHL1PM196, UNKNOWN POSITION). NLM