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Australia makes it clear, signs have the times on. Yes you need a watch to check but if in doubt just go slow.

Norway makes it easy. There's no time modification on the speed signs. It's slow all day err day near schools.

In a world where it is reasonable to have the road always be a slower speed for pedestrian, especially school, traffic this is by far the best option, imo.

Kind of. They have times + "SCHOOL DAYS" - When are school days you may ask? Well, it's any day the school is in session (excluding holidays) and not every adult will know when school is in session or not.

Many will also have flashing lights on them. However, the flashing lights do not override the time nor "SCHOOL DAYS".

If the lights are flashing out-of-hours you can disregard the sign, but if the lights are NOT flashing and it IS the time+day then you need to respect the sign.

ie. The flashing lights are irrelevant, and are only to catch attention.

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