HEARD A LOUD 'BANG' UNDER THE HOOD WHILE CRUISING @ 72MPH ON A NEW HAMPSHIRE INTER-STATE. IMMEDIATELY LOST CONTROL AND CRASHED INTO A GUARD RAIL, BOUNCED BACK INTO THE HIGHWAY, HIT THE GUARD RAIL AGAIN AND WOUND UP BACKWARD INTO THE GUARD RAIL. SOME WITNESSES STATED THAT THEY SAW FIRE AND SMOKE UNDER THE FRONT OF THE VEHICLE. *BF *TR