I found this Ford article that explains the linkage between speed sign detection and cruise speed changing:
https://www.ford.ca/support/how-tos/ford-technology/driver-assist-features/what-is-speed-sign-recognition/#:~:text=When%20driving%20with%20cruise%20control,the%20speed%20of%20the%20vehicle.
I just went on the road to test the cruise control after disabling the speed sign recognition. I’m pleased to report the cruise control worked perfectly. I tried it at low speed (65 kmh or about 39mph) and higher speed (100 kmh or about 60 mph) - all fine. The adaptive cruise worked as well...
See this thread in this forum to a discussion about a possible link between sudden unintended changes in set cruise speed and speed sign recognition.
https://www.ranger6g.com/forum/threads/adaptive-cruise-sudden-acceleration.14394/
My 2024 Ranger FX4 with 1000 km has the same issue. The cruiser speed I set (And which number appears in the dash display) will go up or down about 10 kmh unexpectedly and the truck will either accelerate quickly or slow dramatically. The actual number on display in the dash display changes. I...