And the same researcher's study in Edinburgh found that deaths were cut by a quarter and injuries by a third.
https://www.ed.ac.uk/news/2022/slowi...s-by-a-quarter
"The Belfast scheme, which was restricted to city centre streets, led to a 2 per cent drop in casualties and collisions, and minor reductions.
Researchers say results reflect the scheme’s narrower reach and its implementation in an area where traffic speeds were already low prior to the trial – on average less than 20mph"[/QUOTE
20mph speed limits have 'little impact on road deaths or crashes', according to new research In the wales online
https://www.walesonline.co.uk/news/w...mpact-25526523