COMING OFF I-5 FREEWAY IN WEST WASHINTONG STATE. STOPPED FOR RED LIGHT AND THEN MOVED INTO LEFT TURN LANE BUT CAR KEPT PICKING UP SPEED, APPLIED BRAKES (HARD) SLOWING DOWN BUT AUTO NOT WANTING TO STOP. APPLIED EMERGENCY BRAKE, CAR SLOWED DOWN MORE, COULD HEAR ENGINE RACING AND FEEL IT STILL WANTING TO GO. SLIPPED CAR INTO NEUTRAL ON THE AUTO TRANSMISION, NOW FORWARD PROGRESS SLOWING DOWN GREATLY BUT STILL HIT REAR OF CAR IN FRONT OF ME. FORD IN BODY REPAIR SHOP SO HAVE NOT BEEN ABLE TO TAKE TO FORD TO EXAM FOR ANY DEFECT(S). I ONLY USE MY RIGHT FOOT TO ACCELRATE AND BRAKE SO I KNOW I WAS NOT STEPPING ON GAS PEDAL & OTHER FOOT USING BRAKE AT SAME TIME. CAR HAD BEEN ON CRUISE CONTROL PRIOR TO ACCIDENT SET AT 60 MPH FOR I-5 DRIVING. *TR