LEFT FRONT TIRE THREAD SEPARATED WHILE TRAVELING NORTHBOUND ON I75 AT MILE MARKER 311. SEPARATION CAUSED TRUCK TO VEER LEFT INTO THE MEDIAN GUARD RAIL AT HIGH RATE OF SPEED AND CONTINUE ALONG GUARD RAIL UNTIL STOPPED. 911 CALLED WHICH BROUGHT EMS AND FHP. AAA CALLED WHICH BROUGHT WRECKER. DRIVER AND PASSENGER SHAKEN UP WITH PASSENGER BEING TRANSPORTED TO HOSPITAL BY EMS FOR HYPERTENSION/HIGH BLOOD PRESSURE. FHP FILED REPORT, CASE #FHPC140FF039496. WRECKER REMOVED TRUCK FRONT LEFT WHEEL/TIRE FROM UNDER GUARD RAIL AND TRANSPORTED TO IMPOUND LOT. DAMAGE TO LEFT FRONT OF TRUCK AND ALONG LEFT SIDE TO REAR DUAL WHEELS; FRONT BUMPER, FRONT GRILL, BROKEN STEERING ROD, LEFT FENDER, LEFT WHEEL, LEFT SIDE OF HOOD, DRIVER'S DOOR, AND REAR PASSENGER DOOR. UNKNOWN CONDITION OF FRONT 4WD AXLE OR FRAME. *TR