Initial cost is £32m, that covers things like installing new signs/removing old ones and the leaflet you've had through your door.
Approximately 30,000 replacement signs and 5,000 posts are needed where restricted roads intersect with other road speed limits as well as approximately 2,300 new signs to mark out exceptions that will stay at 30mph. 5,000 signs around school areas will need replacing.
Paperwork relating to exempting roads not turning to 20mph will be around £1m. Communications, so posters, leaflets and adverts, has cost £1.6m.
However, it is also said that the expected reduction in casualties could save the NHS and emergency services up to £92m every year. But an economic assessment by the Welsh Government looked at the longer time economic impact. That included the costs of any delays to travel time which estimated the estimated cost to the economy of £4.5 billion over 30 years.
The 20mph speed limit came into force on Sunday, September 17.
The law impacts restricted roads, which are usually residential or busy pedestrian streets with streetlights. It means that the number of roads which were 30mph has dropped from 37% to just 3%, so a third of roads in Wales are now 20mph.
However, each of Wales' 22 councils could apply for exemptions, meaning that not every road is 20mph.
The Welsh Government say that by making roads 20mph it will reduce collisions, save lives and reduce injuries. The official guidance says the change will also make streets safer for playing, walking and cycling; encourage more people to walk, wheel or cycle; makes our communities safer; improve health and wellbeing and reduce noise pollution.
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