I think this is very much car-dependent, and probably even user-configurable.
For example, the cruise control on my 2021 Mazda 3 doesn't enforce school zone speed limits (or any speed limits), although it recognises them and will flash on the HUD if you're exceeding the limit. Since it's not enforced, I can just ignore it if it has misidentified a speed sign.
Although, school zone signs around my area actually include a bit of genius design: they are hinged in the middle [1], so during school holidays, the signs are covered up by closing the hinge.
Finally, at least in suburban areas in Australia, a school zone covers a couple hundred metres at most. So even if you or your car gets it wrong, driving 20km/h under the speed limit is a very temporary inconvenience for drivers behind you (unlike, for example, driving 20km/h under the speed limit for 50 kilometres on a single-lane highway).
For example, the cruise control on my 2021 Mazda 3 doesn't enforce school zone speed limits (or any speed limits), although it recognises them and will flash on the HUD if you're exceeding the limit. Since it's not enforced, I can just ignore it if it has misidentified a speed sign.
Although, school zone signs around my area actually include a bit of genius design: they are hinged in the middle [1], so during school holidays, the signs are covered up by closing the hinge.
Finally, at least in suburban areas in Australia, a school zone covers a couple hundred metres at most. So even if you or your car gets it wrong, driving 20km/h under the speed limit is a very temporary inconvenience for drivers behind you (unlike, for example, driving 20km/h under the speed limit for 50 kilometres on a single-lane highway).
[1] https://www.canberratimes.com.au/images/transform/v1/crop/fr...