the sign says the hours for the reduced speed limit or, more commonly in my experience, has a light that activates during school hours.
Needless to say, most people regularly violate some kind of traffic law, we just don't enforce it.
The answer is encoded in the map data in this case, but it's an interesting category of problems for autonomous vehicles.
I was very impressed about the decision making in this situation. Seems very intuitive (at least superficially).
in my estimation the robo driver has reached a median-human level of driving skill. it still doesn’t quite know how to balance the weight of the car through turns and it sometimes gets fussy with holding lanes at night but otherwise it mimics human behaviors pretty well except where they’re illegal like rolling through the first stop at a stop sign.