THE INCIDENT OCCURRED DURING RUST HOUR TRAFFIC. MY VEHICLE WAS ON THE HIGHWAY AT 70 MPH, I HAD THE CRUISE CONTROL ON. I TRIED TO SLOWDOWN BY PRESSING ON THE BRAKE BUT THE VEHICLE STARTED TO ACCELERATE. I HAD TO MOVE TO THE SLOW LANE (2 LANES TO THE RIGHT) TO GET TO THE SHOULDER.I HAD TO LITERALLY STAND ON THE BRAKE PEDAL WITH MY WHOLE WEIGHT ON THE PEDDLE TO STOP THE VEHICLE. I WAS ABLE TO SLOW DOWN THE VEHICLE AND STOP BY FORCING THE GEAR LEVER IN TO PARK POSITION. WHEN THE VEHICLE STOPPED, THE ENGINE WAS STILL ACCELERATING. I HAD TO TURN OFF THE IGNITION TO STOP THE ENGINE ACCELERATION. *TR