NHTSA Complaint #11446971 — 2018 HONDA FIT

The automated braking system deployed at maximum braking without warning 3 times in 60 miles of highway driving (this was the first time I had driven this car on a highway). The road in front was completely clear of both cars and debris for several miles, it was sunny without glare, and the road was dry. The one common factor was that all 3 times occurred while passing a semi truck, as I pulled level with the cab. I was thrown forward against the seatbelt while the car slammed on its brakes while beeping and flashing the orange 'BRAKE' warning, dropping from highway speeds by about 25 mph before I was able to intervene. Thankfully there was also no traffic behind me, so I was able to recover control of the vehicle, but otherwise this would have absolutely caused a collision. Prior to this incident, there were no warning signs or indications of a problem. I had purchased the vehicle as a Certified Pre-Owned vehicle less than a week before, at which point it had been thoroughly inspected by the dealership and certified as free from issues. I have reported the issue to the dealership, but from cursory searching online it appears this is a known, unremediated issue - a quote from Wilde East Towne Honda (not my dealer): "You may find that CMBS is giving you notifications and even feedback when no threat is detected. That is normal on occasions...CMBS picks up 'optical illusions' occasionally"