Plans to introduce 20mph speed limits in all residential areas of Wales have been backed by the Senedd.
This week an independent report recommended Wales becomes the first nation in the world to adopt the new measure by 2023 and received support in Cardiff this week.
It would see all roads in residential areas have a default 20mph speed limit, with communities and local authorities, deciding which should remain at 30mph.
The report, comes after a year-long study by a task force made up of police, local authorities, public health experts and other key partners such as road safety groups.
It concluded: "Excessive traffic speed in urban areas is the cause of many road collisions and casualties in Wales, which are still well above the targets set by the Government.
"Setting a 20mph limit on most urban roads and streets will lead to a significant reduction in road danger, even in the short term when speeds are only likely to drop by a relatively small amount."
At the Senedd debate, supporters welcomed the proposals with saying it would make roads safer, reduce accidents and save lives although there were questions raised over issues including enforcement and the possibility of more speed humps being introduced.
David Rowlands MS claimed it would not alter the habits of speeders who caused accidents and argued it was less environmentally friendly to drive cars at 20mph rather than 30mph.
Welsh Government deputy transport minister Lee Waters, who introduced the independent report, said 80 children were killed or seriously injured on Welsh roads in the last year figures were available for.
"That’s 80 families whose lives will never be the same again," he said.
Mr Waters said: "Even a 1mph drop in average speeds is likely to see a 6% drop in casualties."
He added: "Whilst we have made progress on reducing deaths on our roads in the 21 years of devolution, despite our considerable efforts, there are still 4,000 accidents which result in injuries every year in Wales.
"The evidence is clear, reducing speed reduces accidents. It saves lives.
"Slower speeds in our communities improves quality of life too.
"According to the British Crime Survey, speeding traffic was rated as the most serious anti-social problem.
"Furthermore, fear of traffic tops the list of parent worries, with children kept closer to home, reducing their independence, and leading to the vicious spiral of increased danger, as more people drive their children to school. This, in turn, amplifies health inequalities."
The Welsh Government will now consult over the plans.
A further Senedd vote will be needed before they can be implemented.
