THIS HAPPENED YESTERDAY JULY 10, 2010 SATURDAY IN THE REGIONAL PARKS PARKING LOT. SINCE IT'S UNPAVED SO THERE WAS ROCKS AND DIRT ON THE GROUND SO I WAS DRIVING EXTREMELY SLOW TO COME TO A STOP AT A SPOT TO PARK ' I WAS DRIVING WAY BELOW 5 MPH AND EVEN SLOWER WHEN I WAS ABOUT TO COME TO STOP ' AS I ALSO KNOW OUTSIDE OF THE WIRE FENCE, BEYOND THE NARROW ROAD, IT WAS A CLIFF WITH A SUBSTANTIAL DROP OF ELEVATION; AND I HAVE MY WHOLE FAMILY IN THE CAR. I WAS DRIVING A TOYOTA SIENNA MINI VAN WHICH I HAVE BEEN A LOYAL CUSTOMER AND A BIG BELIEVER OF THE QUALITY. JUST AROUND THE TIME THE CAR IS ABOUT TO STOP, ALL OF A SUDDEN, IT SPED UP FORWARD IN SUCH A FORCE WE WERE ALL PUSHED BACK AGAINST THE SEAT BACK, I IMMEDIATELY MOVED MY FOOT TO THE BRAKE AND PRESS ALL THE WAY BUT IT WAS NOT RESPONSIVE AND DID NOT SLOW THE CAR. INSTEAD, THE CAR SPED UP AND WENT THROUGH THE WIRE FENCE AT ABOUT 45 DEGREE ANGLE, WHILE I WAS STEERING TOWARDS LEFT TO AVOID IT WITH VERY LITTLE EFFECT, AND DROPPED DOWN THE SLOPE ONTO THE ROAD, ALL THE WHILE KEPT SPEEDING UP, AND THEN GOT ACROSS THE ROAD AND HIT A WOODEN POLE ON THE ROAD SIDE BY THE CLIFF STRAIGHT ON. THEN THE CAR STOPPED AND THE BRAKE SEEMED TO WORK AGAIN AS MY RIGHT FOOT WAS PUSHING ALL THE WAY DOWN ON THE BRAKE FOR THE WHOLE TIME ' SO I SHIFTED TO PARK, TURNED OFF THE ENGINE, AND THEN OPEN THE DOOR TO TELL PEOPLE COMING UP THAT WE WERE FINE. SOMEONE CALLED THE HIGH WAY PATROL AND THE OFFICER ARRIVED LATER TO TAKE THE CASE AND LATER TRANSFER