NHTSA Complaint #11452070 — 2021 TESLA MODEL 3

The Traffic Aware Cruise Control and Auto-Steer are easily confused so that the vehicle does unexpected things like suddenly slowing down, even heavy breaking, or disengage steering control while in a corner next to semi-truck. This commonly happens when driving at higher speeds, 70 MPH, on the freeway. Suddenly slowing down at such a high speed is dangerous when there are cars following me as they don’t expect a sudden slow down when they can clearly see there is no reason for our car slamming on the brakes. In my observation this problems occur most frequently at higher speeds and when approaching a semi truck or overpass. It is especially worse when going through a corner. Sometimes the center barrier seems to cause sudden slowing down. Also, driving in a corner on the freeway while driving next to a semi truck has caused the auto steer to suddenly disengage which in itself was not dangerous since I had both hands on the steering wheel, it certainly startled me which could potentially be dangerous.