UNKNOWN. I WAS BASICALLY DRIVING ON THE FREEWAY, WHEN MY CAR'S ENGINE SUDDENLY STOPPED RUNNING. THE CAR WAS AUTOMATICALLY PUT INTO NEUTRAL AND WAS NOT ABLE TO CONTROL THE SPEED OF THE CAR, SO I HAD TO MOVE TO THE SIDE OF THE FREEWAY. AS I WAS SITTING IN THE CAR, I STARTED SMELLING BURNED WIRE AND INTERIOR STARTED TO FILL WITH SMOKE. I IMMEDIATELY TURNED THE CAR OFF AND GOT OIT. AS I WAS STANDING FAR AWAY FROM THE VEHICLE, FLUID STARTED LEAKING AND IT HAD CAUGHT INTO FIRE. THE FRONT BUMPER WAS COMPLETELY BURNED OFF, AS WELL AS SOME OF THE ENGINE AND ELECTRICAL PARTS WERE AFFECTED AS WELL.