The limitation to school zone is stupid though. There aren’t more collisions in school zones.
Also the recommendations are based on the results of an incident at x speed not the effectiveness of putting a sign up in reducing speed.
A general rule of 40 everywhere in residential would be a wonderful compromise along with building in traffic calming to make 40 feel like the correct speed. Then when people slam on the breaks at 40 they can get to 30 before mowing people down.
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