I APPROACHED THE INTERSECTION OF CORTZ RD. AND 34 ST. IN BRADENTON, FL IN HEAVY TRAFFIC. THE TRAFFIC LIGHT CHANGED FROM RED TO GREEN, THE LINE OF TRAFFIC STARTED TO MOVE FORWARD. I APPLIED ACCELERATOR AND BRAKE AS NEEDED WITH TRAFFIC, THEN THE CAR IN FRONT OF ME STOPPED SUDDENLY ,I LET UP ON THE ACCELERATOR AND PRESSED THE BRAKE AND THEY DID NOT RESPOND AS THEY SHOULD HITTING THE CAR IN FRONT OF ME. THIS ALL RESULTED IN A 5 CAR CHAIN REACTION CRASH. IT SEEMED AS MY CAR WANTED TO KEEP ON GOING AS IF I HAD NOT DONE ANYTHING TO STOP. THIS IS THE SECOND TIME I HAVE HAD TROUBLE WITH ACCELERATION AND BRAKE CONTROL WITH THIS CAR IN JUST OVER 30 DAYS. THE CAR IS STILL IN THE REPAIR SHOP. I DO NOT HAVE ANY CONFIDENCE IN THIS CAR TO OPERATE CORRECTLY OR IN SAFE MANNER. TOYOTA HAS DONE NOTHING FOR ME TO FIX THIS PROBLEM. I HAVE TRIED TO CONTACT TOYOTA BY PHONE AND COMPUTER WITHOUT SUCCESS. I HAVE BEEN TO A TOYOTA DEALER TWICE AND THEY REFER ME TO TOYOTA CUSTOMER SERVICE PHONE NO. BECAUSE THE SIENNA MODEL IS NOT PART OF THE RECALL. HOWEVER WHEN I GO TO THE NHTSA.DOT.GOV WEB SITE THERE ARE SEVERAL CASES LISTED OF ACCELERATION PROBLEMS WITH THE SIENNA. PLEASE HELP. *TR