DRIVING TO GET THE MAIL.OUR MAIL BOX IS AT THE END OF OUR ROAD ABOUT HALF A MILE FROM THE HOUSE. THERE IS A DRAINAGE DITCH THAT MUST BE CROSSED PARALLEL TOO THE ROAD THAT HAS THE MAIL BOXES ON IT. THIS IS A T INTERSECTION. JUST BEFORE THE DITCH THE CAR SLOWED SO I PRESSED THE THROTTLE TO REGAIN SPEED AND NOTHING HAPPENED I PRESSED THE THROTTLE AGAIN AND IT ACTED AS IF IT HAD BEEN FLOORED AND DID NOT RETURN. THE CAR SPED UP AND WENT INTO THE DITCH EVEN THOUGH I WAS PUSHING ON THE BREAK.IT FLEW OUT OF THE DITCH AND THROUGH THE MAIL BOXES, TAKING OUT THREE BOXES AND TRAPPING ME IN THE CAR WITH BOXES ON EACH SIDE PREVENTING THE DOORS FROM OPENING. THE CAR RECEIVED A LOT OF BODY DAMAGE AND HAD TO GO TO THE SHOP. *JS