NHTSA Complaint #10873579 — 2015 TESLA MODEL S

WHILE DRIVING THE CAR AND ACCELERATING TO HIGHWAY SPEED, WITH AUTOPILOT/TACC ENABLED IT WILL BRAKE HARD FROM HIGHWAY SPEEDS TO AND INCORRECT "KNOWN" 45 MPH (+5 MPH AUTO PILOT THRESHOLD). I USE "KNOWN" AS IT APPEARS TO BE GPS DATA THAT PRESENTS THE MPH. THE ACTUAL SPEED LIMIT IS 65 MPH. DRIVERS WILL NOTICE THE CARS DASH BOARD WILL DISPLAY THE INCORRECT MPH AS WELL. RESULT IS THAT WHEN GETTING ON TO HIGHWAY, IT SLOWS YOU BACK DOWN TO 45-50 MPH. IF ACCELERATING ON AN ON RAMP, WITH CRUISE CONTROL ACTIVE IT WILL SLOW THE VEHICLE. MERGING INTO TRAFFIC ALREADY AT HIGHWAY SPEEDS AND HAVING THE MODEL S CRUISE CONTROL/ AUTOPILOT SLOWING DOWN WILL CAUSE REAR END ACCIDENTS INTO THE MODEL S. THIS SPECIFIC SCENARIO WAS ON A HAS HAPPENED MULTIPLE TIMES AND I HAVE MADE TESLA AWARE OF THE DEFECT/BUG. THIS ALSO HAPPENS WHEN PASSING UNDER OVERPASSES WITH A MPH THAT IS LESS THAN THE HIGHWAY SPEED LIMIT. IT HAS BEEN 3 MONTHS AND IT HAS NOT BEEN CORRECTED. THIS INCIDENT HAPPENED IN A CLOVERLEAF INTERCHANGE. I HAVE UNCOVERED OTHER DEFECTS OF THIS NATURE AND WILL REPORT THEM IN SEPARATE INCIDENTS. ALL INCIDENTS HAVE BEEN SUBMITTED TO TESLA MOTORS AND TO MY KNOWLEDGE THEY ARE PLANNING TO CORRECT THE SITUATION. I HAVE MORE DATA ON THIS SUCH AS GPS LOCATION DATA, LOGS, ECT IF NEEDED.