ON THURSDAY , JUNE 7 AROUND 6:30 PM I MET WITH A BIZARRE INCIDENT ON MY 2015 TESLA MODEL S , 70D. INCIDENT TOOK PLACE ON RT 83 NEAR OAK BROOK MALL NEAR CHICAGO. THE CAR SLOWLY ROLLED AND APPROACHED A SEMI IN FRONT IN A TRAFFIC JAM. I HEARD A BEEPING SENSOR AS IT WAS ABOUT TO TOUCH THE SEMI, I IMMEDIATELY PRESSED THE BRAKE BUT THE CAR STARTED ACCELERATING INSTEAD. I THOUGHT I MUST HAVE PRESSED THE GAS PEDAL, SO IMMEDIATELY LIFTED MY FOOT TO MAKE SURE I WAS PRESSING THE BREAK PEDAL. THE SECOND TIME ALSO IT STARTED ACCELERATING AND KEPT PUSHING THE SEMI IN FRONT BECAUSE IT WAS TOUCHING IT. PERPLEXED I THEN BROUGHT THE CAR TO PARKING MODE TO MAKE IT STOP. AS THE SEMI STARTED MOVING AGAIN AND THERE WAS SUFFICIENT GAP, THE CAR STARTED FUNCTIONING NORMALLY. I GOT A REPAIR ESTIMATE ON THE FOLLOWING DAY FROM A TESLA APPROVED GARAGE AND THEY HAVE QUOTED ABOVE $4000 TO REPAIR.