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by Doctor_Fegg 1997 days ago
Anecdata:

We recently instituted a 20mph limit across our town (I’m the chair of the town council and also a keen cyclist). We do regular speed surveys.

Not everyone sticks to 20mph. But no one drives above 30mph any more. When we had a 30mph limit, we’d regularly get people driving up to 40mph.

So it’s not perfect, but it does make a difference, here at least.