Wales default 20mph limit reaches two years as critics call it a huge waste of money.
Two years after Welsh Labour introduced a default 20mph speed limit on most built up roads, the policy remains one of the most contested transport decisions in recent memory, with opponents calling it a huge waste of money and warning of major economic damage.
The law took effect on 17 September 2023. It set 20mph as the default on restricted roads with street lighting while allowing councils to apply exceptions where 30mph remains appropriate.
Public opposition has been significant. A Senedd petition calling for the law to be scrapped gathered 469,571 signatures, the largest in Senedd history, and was debated in May 2024.
Commenting, Welsh Conservative Shadow Cabinet Secretary for Transport and Infrastructure, Sam Rowlands MS said:
“The Labour Welsh Government ignored the people of Wales when they forced through their disastrous 20mph speed limit and dismissed a record-breaking Senedd petition calling to scrap it.
“The rollout has already cost taxpayers £32 million, with an estimated economic hit of up to £9 billion. Labour and Plaid’s blanket 20mph speed limit has been nothing short of a disaster for Wales.
“Lower speed limits make sense outside schools, hospitals and in dangerous areas, but Labour and Plaid’s one-size-fits-all approach doesn’t work. The Welsh Conservatives are the only party in the Senedd committed to scrapping Labour’s 20mph speed limit.”
On costs, Welsh Government documents put direct implementation at about 32 to 33 million pounds for signage and communications. A House of Commons Library briefing has cited about 34.4 million pounds. However, after submitting FOI requests, the Welsh Conservatives say it is more like 38 million pounds has been wasted.
The official Regulatory Impact Assessment published with the legislation estimates journey time disbenefits over 30 years at a central figure of 6.4 billion pounds, with an upper bound close to 8.9 billion pounds. Opponents characterise that upper bound as up to 9 billion pounds in incoming economic damage. When these time costs are included the assessment shows a negative net present value. When they are excluded the assessment shows a positive net present value alongside projected public sector savings linked to fewer and less severe collisions.
The Welsh Government says the policy improves safety and quality of life and points to sustained speed reductions. Guidance has been revised since 2024 to help councils review routes, and several local authorities have brought forward changes where 30mph is considered more suitable.
Transport for Wales monitoring also shows average speeds fell after the change. The weighted mean speed across measured sites declined from 28.7 mph before implementation to 24.9 mph by the winter of 2024 to 2025. The share of drivers at or below a 24 mph compliance proxy rose from 20.8 per cent to 54.0 per cent. Early casualty data indicates an 11.8 per cent reduction in total casualties in the first year, with further evaluation under way.
Critics argue that two years on the picture is clear. The policy has prompted the largest petition in the history of the Senedd, required mid course corrections through revised guidance, and carries modelled journey time costs that dwarf the headline implementation bill. The Welsh Conservatives say they will move to scrap the default limit and revert to targeted 20mph zones if they have the power to do so, while ministers maintain that the evidence on speeds and safety justifies keeping the policy in place.
What do you think? Have you driven in Wales recently? Editor@ConservativePost.co.uk
I buy the money argument, but you must refute labour’s lives saved point.