R/R TREAD ON TIRE CAME OFF CAUSING THE DRIVER TO LOOSE CONTROL AND SWERVE TO THE LEFT STRIKING A GUARDRAIL WITH THE LEFT TOP, THE VEHICLE BOUNCED OFF THE GUARDRAIL SLIDING LEFT ON LEFT SIDE AND CAME TO REST ON ITS TOP (TEXAS PEACE OFFICERS ACCIDENT REPORT, BRIDGESTONE/FIRESTONE, P235/75R15, RADIAL ATX M/S, VDHL1M0054, RIGHT REAR). NLM