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No, but 20mph limits are mostly enforced by plenty of people who do drive at 20mph max in them.
Cheaper than actual enforcement when Government policy is full austerity still.
I see your point. Rospa seem pretty sure that they help in terms of reducing average speed overall.
https://www.rospa.com/rospaweb/docs/advice-services/road-safety/drivers/20-mph-zone-factsheet.pdf
I can't find any info from later than 2016 but back then about 60% of drivers exceeded the limit in 20mph zones...it does sound like the existence of the zones has reduced overall speed though.
Stonehedge
No, but 20mph limits are mostly enforced by plenty of people who do drive at 20mph max in them.
Cheaper than actual enforcement when Government policy is full austerity still.