Even with the caveats about limited data and untangling causation and correlation, the statistics are striking: the first year of a scheme in Wales where the speed limit on urban roads was lowered to 20mph resulted in about 100 fewer people killed or seriously injured.
“I just don’t see why the neighborhoods next to the school should also be school zones. Most of the kids are dropped off by cars anyway cause its too unsafe for them to walk” - a North American NIMBY