FIRESTONE/BRIDGESTONE, WILDERNESS AT, P215/65R15, DOT#W2ZFNNA377. TIRE SIDEWALL BLEW OUT WHILE DRIVING AT 70 MPH ON THE INTERSTATE. VEHICLE ENDED UP ON THE SIDE OF THE ROAD. *AK THE CONSUMER INDICATED THAT NOTHNG WAS HIT TO CAUSE THE TIRE TO BLOWOUT. THE TIRE PRESSURE WAS CHECKED BEFORE THE TRIP. IT WAS ALSO CHECK 30 MIN PRIOR TO THE BLOWOUT BECUASE THE CONSUMER FELT A VIBRATION N THE STEERING WHEEL. BOTH TIMES THE PRESSURE WAS NORMAL. *NM