ENTERED BANK PARKING TO USE ATM MACHINE, AT THAT TIME WHEN STEPPED ON BRAKE TO STOP THE CAR, IT ACCELERATED LIKE SOMEONE WAS STEPPING ON GAS PEDAL. AT THAT TIME I TRIED TO STOP THE CAR BY SHIFTING INTO ANOTHER GEAR AND ALSO TRIED PULLING KEY OUT OF THE IGNITION. AT THAT TIME KNEW I HAD TO GET CAR STOPPED WITHOUT HURTING ANYONE, SO THERE WAS A WOODED AREA BEHIND BANK, I RAN CAR INTO AREA THAT HAD HUGE ROCKS WHICH I RAN OVER AND THEREFORE HIT A TREE HEAD ON TO STOP MY CAR. THE CAR WAS STILL RUNNING WOULD NOT SHUT OFF AND WOULD NOT STILL CHARGE GEARS OR CAR WOULD NOT SHUT OFF AND THE AIR BAGS DID NOT DEPLOY (ANY OF THEM). NOT SURE IF THIS IS A BRAKE, ENGINE, TRANSMISSION, COMPUTER, AIR BAG, OR A COMBINATION PROBLEM. *TR