Labour gives green light to 20mph zones
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https://www.ft.com/content/96c8fc18-99c8-410b-997f-3455aef2b507
https://www.ft.com/content/96c8fc18-99c8-410b-997f-3455aef2b507
Having lived in a 20 zone, I can say this is pretty much pointless without enforcement - which sadly isn't going to happen. Perhaps in a few decades attitudes will shift.
The 20mph has had a measurable impact in Wales, and it does lower average speeds even if more people are now driving over the limit. It really should come along with infrastructure changes to reflect the lower limits, but that would take decades and this is something that can be done quickly.