AS I EXITED THE FREEWAY I TOOK MY FOOT OFF THE ACCELERATOR AND APPLIED THE BRAKE. THE CAR ACCELERATED AND DID NOT SLOW DOWN. I CROSSED BOTH LANES OF THE STREET AND I TURNED THE CAR TO THE RIGHT. THE WHEELS OF THE LEFT SIDE OF THE CAR HIT THE CURB AND THE FRONT AND REAR WHEELS ON THE LEFT SIDE OF THE CAR BROKE OFF. THEN, THE CAR WENT OVER THE CURB AND HIT THE STATE SIGN WITH THE LEFT FRONT OF THE CAR. THE CAR GOT STUCK IN DEEP MULCH FROM RECENT LANDSCAPING AND CAME TO A STOP.