STOPPED AT A BUSY CITY STREET INTERSECTION FOR AROUND 2 MINUTES WAITING FOR THE GREEN LIGHT. MY CAR WAS SECOND CAR FROM THE INTERSECTION ON A SLIGHT UP SLOPE. OBVIOUSLY THE BRAKE WAS FULLY ENGAGED BUT MY CAR SUDDENLY CREEPS UP SLOPE AND GENTLY BUMPS INTO THE CAR IN THE FRONT. THIS IMPACT PUSHES THE OTHER CAR FORWARD AND MY CAR ROLLS BACK. THE FORWARD COLLISION ALARM WENT OFF BUT I COULD DO LITTLE TO STOP THE CAR OTHER THAN TRY AND PRESS ON THE BRAKE EVEN HARDER. THE CAR AGAIN ROLLS UP AGAIN AND GENTLY BUMPS THE OTHER CAR AGAIN. AGAIN THE COLLISION WARNING WENT OFF BUT I FELT I HAD NO CONTROL OVER THE CAR. I COULD FINALLY GET THE CONTROL BACK AFTER THAT. LUCKILY THERE WERE NO PEDESTRIANS AND CROSS TRAFFIC HAD ALREADY STOPPED. PLEASE NOTE THAT THERE WAS LITTLE OR NO DAMAGE TO EITHER CAR. THE CAR SEEMED TO HAVE A MIND OF IT'S OWN! THERE WAS LITTLE CHANCE OF DRIVER ERROR IN THIS CASE AS I WAS JUST WAITING FOR THE GREEN LIGHT AND THERE WAS NO PANIC SITUATION FOR A MISTAKEN ACCELERATOR PRESS. I COULD NOT GET ACCESS TO THE CAR LOGS AS TESLA POLICY WOULDN'T ALLOW IT. PLEASE NOTE THAT NO SELF-DRIVING SOFTWARE WAS INSTALLED AND CREEP MODE WAS OFF AS IT ALWAYS IS.