Not sure if this has been covered, but I've always wondered why school zones/playground zones are not more clearly marked. I remember driving through a school zone for the first time in Phoenix and you'd have to be severely severely distracted to not realize it. There were clear marks on the road surface leading up to the zone, and there were traffic facing signs on both sides of the street.
I've noted many times in Calgary where the view to the playground sign is blocked by a tree or parking cars or what not.
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