NHTSA Complaint #11515149 — 2022 TESLA MODEL 3

Just completed a 3 day cross country trip from Palm Desert CA to Saint Paul MN. On a long highway trip like this, we rely on 'cruise control' to maintain consistent highway speeds. Tesla provides adaptive cruise control as a feature of Autopilot. On numerous occasions, the adaptive cruise control unexpectedly stopped, causing the vehicle to slow, or unexpectedly braked hard causing the vehicle to sharply reduce speed. Due to the frequency of Tesla autopilot phantom braking, I found that my foot needed to consistently hover over the accelerator pedal to counter the numerous instances of phantom braking. This was necessary to prevent a possibly inattentive driver behind the Tesla from driving into the rear of the Tesla or another vehicle driving behind the Tesla. This phantom braking occurred as many as 6 to 10 times per day over 3 days and approximately 2,000 miles. The adaptive cruise feature malfunctions under certain conditions and our vehicle is available for inspection upon request. Our safety and the safety of others was put at risk by unexpectedly slowing or braking hard while driving at posted highway speeds and putting our vehicle at risk of being rear ended, and perhaps the same for a vehicle behind our vehicle. The phantom braking issue has been well documented in press & social media and I find it difficult to believe that it has not been reproduced by an independent organization such as NHTSA. I believe that the manufacturer (Tesla) is aware of the phantom braking issue as it appears to be inherent to Tesla's approach to providing adaptive cruise control. When the phantom braking occurs, there are no warnings or messages prior to the unexpected braking. Most phantom braking instances occurred on approach to or on the crest of a hill. At least one instance occurred after cresting a hill and the roadway was in full view.