BACKING DOWN ACCESS ROAD TO PARKING LOT, BOAT RAMP AND RECREATION AREA. HAD FOOT ON THE BRAKE WHEN SUDDEN ACCELERATION ENDANGERED CAR AND DRIVER. DIRECTED CAR INTO THE SIDE OF A PARKED TRUCK TO AVOID CRASHING INTO AREA WHERE PEOPLE WERE WORKING, AND ALSO TO AVOID GOING INTO RIVER WHICH WAS VERY CLOSE BY. BACK END OF CAR STRUCK SIDE OF TRUCK THEN CAR BOUNCED OFF CAREENED TOWARD RIVER WITH ACCELERATOR STILL JAMMED. PRESSED FOOT DOWN HARD ON BRAKE AND PULLED UP E BRAKE UNTIL CAR FINALLY STALLED. *TR