More than 10,500 requests have been received by Welsh councils from residents to reassess roads that saw their limit lowered when the policy was introduced in September last year.
Police point to a drop in road causalities and crashes to suggest Wales’ flagship policy is working, although a recent poll said seven in 10 people still oppose the new limit.
One motoring organisation has said traffic calming measures like speed bumps should be installed to force drivers to do 20mph.
Welsh ministers said a 20mph limit would reduce deaths and noise and encourage people to walk or cycle when it was implemented in September 2023 - but it caused controversy with some drivers.
The limit changed on about 35% of Welsh roads - about 22,000 miles (35,171 km) in total - last year where lamp-posts are no more than 200 yards (183m) apart.
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Statistics show a drop in casualties on 20mph and 30mph roads in Wales in the first three months of 2024, after the default built-up area limit was reduced.The number of serious casualties or fatalities has dropped 23%, and Wales’ largest police force says there have been at least 11 less deaths on the roads in their area.
In Greater Manchester, we have 20mph zones in suburban areas and side roads with housing. I think this is sensible and safe for families, dog walkers and the elderly, who walk around the area they live. However, very few people appear to stick to the limit, as enforcement is lacking. This is the perfect place for speed cameras, to enforce the local speed limits.