NHTSA Complaint #11507625 — 2021 FORD EXPLORER

While using Intelligent Adaptive Cruise, the vehicle suddenly thought the speed limit was 85mph and quickly started accelerating. Confused, I hit the brakes to stop the acceleration. I have uploaded a photo of the dash that I took showing that the system read the speed limit sign as 85. I saw no speed limit sign in the area, so, I have no idea what prompted the system to change speed. I was talking on the phone via Android Auto and using Waze, via Android Auto, USB direct connect. The only other problem I've ever had with this system is on interstates that have specific Truck speed limits in West Virginia. There, sometimes trucks have slower speeds and this system picks up those truck speeds and decelerates/brakes to comply. While it can be overridden in the moment, the next time it sees such sign, it slows again. This sudden deceleration poses a hazard to other drivers who do not expect a 'non-truck' vehicle to suddenly slow.