The Welsh government included the new default limit in the party’s manifesto ahead of the 2021 Senedd election.
In it, the party, led by Mark Drakeford, pledged to make 20mph the norm in residential areas.
The legislation was approved by the Senedd in July last year, meaning Wales is the first UK nation to introduce a default limit.
Why are they doing it?
The government says the change will save lives and help build “safer communities” by reducing the number of collisions.
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It says default 20mph limits will make streets quieter by reducing noise pollution.
First Minister Mark Drakeford has also said people will have more confidence to cycle and walk around their local communities with vehicles travelling at slower speeds.
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Has it been done elsewhere?
Spain changed its default speed limit on roads with a single lane in each direction to 30km/h (18.6mph) in 2021.
The country’s directorate-general for traffic said the risk of death in a road traffic collision was reduced on a road with a lower speed limit.
It said the risk was 80 percentage points lower if the speed of the impacting vehicle was 30km/h, compared with 50km/h.
Image: Scotland hopes to lower the speed limit of most residential roads to 20mph by 2025
Could it be introduced in other parts of the UK?
In Scotland, the government hopes to lower the speed limit of most residential roads to 20mph by 2025.
The SNP and the Greens outlined the proposal as part of the shared policy programme they published in 2021.
While there is no nationwide rollout in England, several areas, including Bristol and Manchester, have either already introduced a default limit of 20mph or have outlined plans to do so.
All roads within London’s congestion charge zone also have a 20mph speed limit.
How will it be enforced?
Just as with any other speed limit, police officers will enforce them.
The RAC says people should pay “full attention to all road signage” and shouldn’t rely on their sat navs to know what the speed limit is on roads in Wales until systems have updated.
Its head of policy, Simon Williams, also said RAC research suggested compliance with 20mph speed limits is quite poor and added it would be “more effective to target areas where they are most needed”.
While many support the policy, it has also faced significant criticism, particularly from the largest opposition party in the Senedd, the Welsh Conservatives.
Group leader Andrew RT Davies has previously called it an “economy-stifling vanity project”.
Plaid Cymru leader Rhun ap Iorwerth accused the Conservatives of “playing politics” but admitted even people who were supportive of Labour’s policy in principle had “real concerns”.
He told the first minister in the Senedd chamber the policy should be reviewed after seeing how it works in practice.
A man accused of driving into crowds at Liverpool FC’s title parade faces 24 new charges.
More than 130 people, including children, were injured when Paul Doyle allegedly drove his Ford Galaxy vehicle into hordes of fans at the celebrations on 26 May.
The 53-year-old, of Croxteth, Liverpool, was originally charged with two counts of wounding with intent, two counts of causing grievous bodily harm with intent, two counts of attempted grievous bodily harm with intent, and one count of dangerous driving.
Six of the new alleged offences relate to babies, including one six-month-old and one seven-month-old, proceedings at Liverpool Crown Court heard on Thursday.
The new indictment, which was not read out in court, now has 31 counts relating to 29 victims, aged between six months and 77 years old.
Doyle now faces 18 counts of attempting to cause grievous bodily harm, nine counts of causing grievous bodily harm with intent, two counts of wounding with intent, one count of dangerous driving and one count of affray.
He appeared in court via video link from prison and was in tears.
Travellers are being warned about mosquito bites on holiday after a rise in chikungunya infections in people returning to the UK.
The UK Health Security Agency (UKHSA) also said the first cases of the emerging oropouche virus had been recorded.
Chikungunya typically causes sudden fever and joint pain, which can be debilitating, and lasts from a few days to weeks.
The name comes from a word in a Tanzanian language meaning “that which bends up”, owing to the joint pain associated with it.
Most people recover but in some cases the symptoms can last several months or even years.
It’s spread by mosquito bites in tropical and subtropical regions, and most of the 73 cases reported in the UK so far this year were in London and linked to travel to Sri Lanka, India, and Mauritius.
Only 27 cases were reported in the same January to June period last year.
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Chikungunya can’t spread directly from person to person – so if someone becomes ill in the UK, they can’t pass the infection on, and the mosquitos responsible aren’t present here.
Dr Philip Veal, consultant in public health at the UKHSA, said it can be a “nasty disease” and the increase in cases was “worrying”.
“It is essential to take precautions against mosquito bites when travelling,” he said.
A man staying at a hotel that has been the focus of a series of protests has denied a charge of sexual assault and faces a trial next month.
Mohammed Sharwarq, a 32-year-old Syrian national, was arrested after police were called to the Bell Hotel on the Epping High Road in Essex yesterday, police said.
Sharwarq, who is alleged to have kissed a man on the neck, indicated a plea of not guilty to a charge of sexual assault at Chelmsford Magistrates’ Court today.
He indicated guilty pleas to six further charges concerning four complainants – with two counts of common assault and four of assault by beating.
Sharwarq is alleged to have punched a man in the face, thrown an object at a man, slapped a third man in the face and attempted to punch a fourth.
Sky News understands the alleged offences took place inside the hotel between 25 July and 12 August.