Welsh ministers say 20mph will save lives, but research suggests it has not cut crashes in Belfast.
The move was backed by Labour and Plaid Cymru but opposed by the Welsh Conservatives, who said a blanket rollout would be "ludicrous".published by the Journal of Epidemiology and Community Health looked at data from before and after the limit was introduced on 76 roads in central Belfast in 2016.
The authors argued that 20mph limits could be combined with other measures like driver training, CCTV and police communications for "an ambitious culture change". The authors of the report noted their research was smaller in scale than some other studies on the topic."Twenty is a very sensible speed limit," Mr Williams said, "but it must imply that something must have been going on [in Belfast] and people are just completely disregarding the speed limit.""Unless it is strongly enforced or some clever road design to slow people down you do find that average speeds drop which is an overall benefit to road safety.
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