SITTING AT DRIVE UP ATM VEHICLE IN PARK ENGINE RUNNING, AFTER BUSINESS TRANSACTION PLACED RIGHT FOOT ON BRAKE AND MOVED VEHICLE FROM PARK TO DRIVE AND INSTANT INDEPENDENT FULL ACCELERATION OCCURRED. BRAKES HAD NO EFFECT IN SLOWING VEHICLE. APPROXIMATELY EIGHT SECONDS LATER CRASHED INTO VEHICLE ON BUSY HIGHWAY MY VEHICLE FRONT END TOTALED. STEERING COLUMN COLLAPSED, STEERING WHEEL BENT, LEFT AREA OF FIREWALL PUSHED IN.. NO AIRBAGS DEPLOYED.. PUT SEAT AND SHOULDER BELTS KEPT INJURES TO MINOR CONTUSIONS AND BRUISES. *BF*TR*JB