NHTSA Complaint #11504325 — 2020 TESLA MODEL 3

On a recent trip, while using the adaptive cruise control on a divided, straight, flat four lane highway, the vehicle would randomly slam on the brakes for absolutly no reason, endangering us and other vehicles behind us, who were not expecting a random slam of the brakes. Driving conditions were ideal - sunny, excellent visibility and very low traffic. There were no oncoming or road-crossing vehicles and no vehicles in front of us on the divided highway to trigger the reaction. This happened 14 times over about 200 miles of driving on our return trip home and over 30 times on the trip out. On the outbound trip, I was using it on both the divided highway and sections where there was only one lane in each direction, so decided to just use the cruise control when there was a divided highway. This is a recent phenomenon, as cruise control has never done that before. The semi-autonomous mode does it all the time as well, so we stopped using it for fear of causing an accident.