I WAS IN STOP AND GO TRAFFIC. I DON'T REMEMBER IF I WAS TAKING FOOT OFF BRAKE, OR GAS PEDAL. THIS HAPPEN WITHIN SECONDS. CAR STARTED TO ACCELERATE, I SLAMMED ON BRAKES STILL MOVING, I PULLED EMERGENCY BRAKE, STILL MOVING, I HIT BACK END OF PICK-UP TRUCK. BY THEN I HAD PUT CAR IN PARK AND TURNED OFF IGNITION.