IT WAS A SUNNY AND VERY HOT DAY, TEMPERATURES ABOVE 90 DEGREES. THE VEHICLE WAS PROCEEDING WEST ON A 2 LANE IN TOWN STREET, WITH NO CURBS, WITH ONE VEHICLE IN FRONT, STOPPED AT THE INTERSECTION TO A 2 LANE HIGHWAY. AS THE VEHICLE WAS APPROACHING THE RAILROAD TRACKS, WITH A SLIGHT INCLINE, THE DRIVER APPLIED THE BRAKES FOR THE STOP SIGN AFTER THE RAILROAD TRACKS. AS THE DRIVER APPLIED THE BRAKES, THE CAR ACCELERATED TOWARDS THE HIGHWAY. AT THIS POINT, THE DRIVER SAID, 'IT'S NOT STOPPING'IT'S NOT STOPPING.' TO THE OVER 2 PASSENGERS OF THE CAR. THERE WAS A CAR IN FRONT OF THE CAR, WAITING TO TURN ONTO THE HIGHWAY AND CAR GETTING READY TO CROSS THE HIGHWAY, AS WELL AS A CAR ON THE HIGHWAY NEAR THE INTERSECTION. THE DRIVER CONTINUED TO APPLY THE BREAKS WITHOUT THE CAR BREAKING AND VEERED TO THE LEFT TO TRY TO AVOID THE CAR IN FRONT. AS THE CAR ACCELERATED, IT HIT THE CAR IN FRONT AND BOUNCED OFF THE LEFT BACK BUMPER OF THE CAR IN FRONT AND CAME TO A STOP. THEY CARS WERE NOT MOVING AT A HIGH RATE OF SPEED BUT THE CAR IN QUESTION WAS NOT STOPPING EVEN WITH THE BREAKS APPLIED, FOOT ON THE BRAKE PETAL, FOOT NOT ON ACCELERATOR. IT WAS ACCELERATING. THE CAR WAS PUT INTO PARK. THE CAR SEEMED TO 'HAVE A MIND OF IT'S OWN' NOT BREAKING BUT ACCELERATING. THERE WAS AN UNKNOWN CAUSE FOR THIS AS OF THIS TIME. A COUNTY DEPUTY WAS IN THE AREA AND CAME OVER TO THE ACCIDENT.