Earlier quoted context omitted.
They should just always observe the lower speed limit. The difference is usually 5 or maybe 10 mph. Which over the distance of a school zone is nothing.
It can be dangerous though. In my area we have roads with speed limits of 45 that drop to 25 "when children are present". My EV always assumes children are present as it has no real way to determine if they are. Driving 25 in a 45 is dangerous for many reasons.
A building that looks the same with it without children inside of it.