AT 4:45 PM ON 2/5/2009 , I DROVE MY 2007 TOYOTA PRIUS WEST ON SW ANDOVER ST. IN SEATTLE WA. I SLOWED AS I MADE A RIGHT TURN TO PARK PERPENDICULAR TO THE STREET WITH A 6 FOOT HIGH CHAIN-LINK FENCE IN FRONT OF ME ON TOP OF A RETAINING WALL. THE BOTTOM OF THE WALL IS 6 FEET BELOW STREET LEVEL ON A PAVED PARKING AREA. AS THE PRIUS APPROACHED THE FENCE, I BRAKED TO STOP, BUT THE CAR DID NOT SLOW ,SO I FLOORED THE BRAKE. THE CAR HIT A FENCE POST, PULLING IT OUT OF ITS MOUNT AND THEN THE CAR MOVED OVER THE TOP OF THE WALL PUSHING THE POLE AND FENCE OVER ITS HOOD & ROOF,. THE FRONT OF THE PRIUS DROPPED TO THE AREA BELOW THE WALL WHILE THE REAR REMAINED ON THE TOP. THE FENCE MESH STRETCHED BUT SLOWED THE PRIUS'S FORWARD MOVEMENT AND KEPT THE REAR FROM GOING OVER THE WALL.. THE DASHBOARD WAS STILL LIT AND I LOWERED THE ELECTRICAL WINDOWS AND YELLED FOR HELP. THE FIRST ARRIVAL TOLD ME TO "TURN OFF THE CAR". THIS IS SIGNIFICANT BECAUSE THE ONLY WAY HE COULD HAVE KNOWN THE CAR WAS RUNNING WAS IF HE HEARD THE SOUND OF THE PRIUS'S GASOLINE ENGINE THAT ONLY KICKS IN AT HIGHER SPEEDS. I OPENED THE DOOR AND JUMPED DOWN TO THE PAVEMENT. THE POLICE CAME AND MADE A REPORT. I DID NOT RECEIVE A CITATION. THE PRIUS WAS EXTRACTED BY A TOW COMPANY AND HAULED AWAY. FORTUNATELY I RECEIVED NO PHYSICAL INJURY. THE CHAIN LINK FENCE WAS TRULY A SAFETY NET. ON 2./12/ 2009, MY INSURANCE COMPANY , USAA, DECLARED MY PRIUS "TOTALED" AND MADE A SETTLEMENT PAYMENT. I THOUGHT PERHAPS MY BRAKES HAD F