NHTSA Complaint #11452143 — 2022 TESLA MODEL 3

I was traveling northbound on a two lane highway with a speed limit of 55mph. I was traveling 60mph with Tesla autopilot to include autosteer engaged, it was light outside and partly cloudy. A tractor trailer approached traveling southbound in the opposite direction, my vehicle immediately slammed on the brakes, dropped speed to under 25mph, and the forward collision warning chimes and alerts on the screen started. It should be noted I was well within my lane of travel going northbound; the tractor trailer was also well within its lane traveling southbound. At no point did my vehicle or the tractor trailer veer towards each other, and at no point was there ever a chance of our vehicles colliding. This happened a total of two times, both times the circumstances were identical involving tractor trailers.