WHILE DRIVING ON INTERSTATE, SUDDENLY THE WHEEL JERKED TO THE LEFT AND MY VEHICLE CRASHED INTO THE MEDIAN GUARD RAIL THEN VEERED BACK ACROSS THE ROAD TO STOP ON AN EMBANKMENT. THE CAUSE OF THE WHEEL JERKING TO THE LEFT IS UNKNOWN. FORTUNATELY THERE WERE NO OTHER VEHICLES INVOLVED. WHEN THE DRIVER'S SIDE CURTAIN AIRBAG DEPLOYED, MY HEAD BECAME TRAPPED BETWEEN THE DRIVER'S SIDE WINDOW AND THE AIRBAG, RESULTING IN CLOSED HEAD INJURY. I BELIEVE THE AIRBAG DEPLOYED LATE CAUSING THIS TO OCCUR. I ALSO BELIEVE THERE IS SOMETHING WRONG WITH THE STEERING WHICH CAUSED THE VEHICLE TO JERK THE WAY IT DID. THE VEHICLE HAS BEEN PROPERLY MAINTAINED AND WAS IN GREAT CONDITION. *TR