Noticed this with hire cars, we have 'school zones' that only operate within certain times (like 7am - 9am and 2pm - 4pm) and new cars pick up the 40 km/h from the sign but obviously aren't smart enough to read the times and realise it's not in effect, so the car thinks you're speeding by 20 km/h and you get all these beeps and bobs.

I also had one that couldn't tell the difference between a speed sign and a speed 'ahead' sign so it'd start screaming at you hundreds of metres before you reach the actual speed zone!

Then there was the fun of driving on a highway at 110 km/h (I think with a friend with a Tesla) and we passed a school bus that had a '40 km/h when lights flashing' sign on the back but with 40 is in the red circle like our speed signs (like [1]). So the car decided that was the speed of the road and the cruise control suddenly slammed on the brakes! Obviously the lights were not flashing (and wouldn't unless it was stopped at a bus stop and letting off children) but the car is also not smart to interpret any of that!

I'm glad neither of the cars our family owns has any of these features!

1. https://www.austockphoto.com.au/image/40-when-lights-flash-s...