AT ABOUT 3 PM I WAS DRIVING NORTH ON THE ON RAMP OF ROUTE 15 NORTH AT MIRA MESA. SUDDENLY MY CAR ACCELERATED AND WOULD NOT STOP. I MOVED TO THE RIGHT WHERE THERE WAS ROOM. AND DESPITE PUSHING HARD ON THE BRAKE, I COULD NOT STOP THE CAR. I MOVED TO THE GUARD RAIL HOPING TO SLOW THE CAR, WHICH IL DID, BUT THE CAR BOUNCED OFF THE RAIL AND SIDE SWIPED A WHITE LEXUS. THEN THE CAR CAME TO A STOP. A WORKMAN SAW THE ACCIDENT AND CONFIRMED THE PATTERN OF WHAT OCCURRED. HE CHECKED WITH ME AND THE DRIVER OF THE OTHER CAR AND WE BOTH SAID THERE WAS NO INJURY. HE REFUSED TO IDENTIFY HIMSELF. BOTH CARS WERE ABLE TO DRIVE AWAY WITHOUT DIFFICULTY. WHEN I GOT HOME I CHECKED THAT THE FLOOR MATS WERE IN THE PROPER PLACE AND NOT NEAR THE ACCELERATOR. I FEEL THAT THERE WAS A DEFECT IN THE OPERATING SYSTEM OF THE CAR TO CAUSE THIS SUDDEN ACCELERATION. *TR