It can just read the sign surely? My ancient Tesla S can read simple speed limit signs and in France distinguishes between those that apply to it and those tha

It can just read the sign surely? My ancient Tesla S can read simple speed limit signs and in France distinguishes between those that apply to it and those that apply only to lorries because of the notice below the speed limit sign. Then it really would be as simple as looking up the calendar or simply erring on the safe side that all weekdays are schooldays. Waymo only operates on fully mapped roads anyway so I think that Waymo could be reasonably expected to include such abilities.