Drivers who park on the pavement on City Road in Cardiff face a fine of up to £70 as part of a new pilot scheme.
Cardiff council has brought in the new rules to help tackle what it said was an "ongoing problem". The local authority said it could be introduced in other parts of the city as well.
Signs are now in place warning drivers as part of the capital's first "pavement parking ban zone".
Parking on the pavement can only normally be restricted or enforced if there are double yellow lines on the road, or a specific no parking zone is in place.
Outside London and Scotland, without a specific legal order, it isn’t illegal to park on a pavement unless a vehicle is causing an obstruction – an offence that can only be enforced by the police.
But now Cardiff council has brought in the 18-month pilot scheme to help reduce problem parkers.
The ‘no parking zone’ on City Road is now in place and displayed to the public with signs showing where the ‘no parking zone’ starts and ends.
Any vehicle parked either fully or partially on the pavement within one of these zones may receive a Penalty Charge Notice of up to £70.
The enforcement will be carried out by the council’s Civil Enforcement Officers, as well as through using CCTV footage.
The council said the pilot scheme in City Road will be "closely monitored" to see if it helps.
If it's a success, the council said similar schemes could be brought into other areas of the city that are experiencing the same problem.
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A Cardiff council spokesman said: “The council has consulted with the public on pavement parking. In a recent survey, 70% of those who responded felt that pavement parking was an issue in Cardiff and should be made illegal if possible.
“72% of people who responded to the same survey also said they would enjoy walking more if there was less pavement parking in the city.
"Given this, the issue was highlighted for action in the Transport White Paper, which is Cardiff’s transport vision for the city for the next 10 years.”