WHILE PULLING INTO A PARKING SPACE IN MY OFFICE PARKING LOT, I HAD AN UNATTENDED ACCELERATION WHILE MY FOOT WAS ON THE BRAKE. THE CAR LUNGED OVER THE CURB, UP A SLIGHT INCLINE, HIT A SMALL TREE WHICH KNOCKED DOWN THE PERIMETER FENCE. I CALLED THE LEXUS DEALERSHIP AND THEY GAVE ME AN 800 NUMBER TO CALL. I REPORTED WHAT HAPPENED AND THEY SENT A TOW TRUCK TO BRING MY CAR TO THE DEALERSHIP BECAUSE I WAS AFRAID TO DRIVE IT. AT THE DEALERSHIP THEY INDICATED TO ME THAT I WAS NOT SUPPOSE TO BRING IT TO THEM SO I HAD THE MANAGER DRIVE IT TO THEIR COLLISION PLACE WHERE I HAD THE BUMPER REPAIRED. MY INSURANCE COMPANY DID NOT PAY FOR A RENTAL REPLACEMENT. THE REPAIR COST ME $250 (MY DEDUCTIBLE) + THE RENTAL CAR COST OF APPROX. $210.00. MY INSURANCE PAID FOR THE TREE AND FENCE REPAIR OF ABOUT $2,000+. MY CAR WAS SUBSEQUENTLY INSPECTED BY TOYOTA'S INSPECTION COMPANY. IT TOOK ABOUT 3-4 HOURS AND THE END RESULT WAS THAT THE CAR DID NOT HAVE ANY DEFECTS. I CONTINUE TO BE CONCERNED ABOUT WHETHER OR NOT THIS WILL HAPPEN AGAIN AND MAINTAIN A LARGE DISTANCE BETWEEN VEHICLES. IN 2007 MY CAR HAD A SIMILAR PROBLEM WHEN IT ACCELERATED TO A HIGH SPEED BECAUSE THE THROTTLE GOT STUCK DUE TO A MECHANIC'S SERVICE ERROR WHEN WORKED ON THE DAY BEFORE. SINCE TOYOTA SAID MY VEHICLE IS OKAY, I HAD TO PAY THE ALMOST $500 FOR THE REPAIR AND RENTAL CAR AND MY INSURANCE WILL PROBABLY GO UP DUE TO THE PAYMENT MADE TO MY COMPANY FOR THE TREE AND FENCE REPAIR. I THINK THE THROTTLE HAS A FAULTY DESIGN AN