A council is aiming to raise nearly £500,000 a year by clamping down on illegal car parking.
Drivers face a fine of £60 for illegal parking
Carmarthenshire council has been told by the Welsh assembly it can take over from traffic wardens in issuing tickets and fines.
The authority now plans to triple the number of enforcement officers and use the revenue to establish residents-only parking areas in Ammanford, Carmarthen and Llanelli town centres.
Many householders currently have difficulty parking outside their homes because spaces are taken up by shoppers, workers and visitors.
Public meetings will be held to help decide which streets become resident-only and there will be a charge of £20 a year for a permit.
Anyone caught parked illegally will face a fine of £60 - but that could be reduced by 50% for prompt payment.
Carmarthenshire's cabinet member for the environment, Pam Palmer, said: "We have listened to the needs of residents in town centre areas who have been complaining for some time that they cannot park outside their own front doors.
"This scheme will enable them to do just that.
"Effective control on parking whether in the streets or in our car parks is essential in our plans to improve traffic management in our busiest town centres."
Council officers estimate they will raise nearly £400,000 each year through fines.
More than £60,000 will come from receipts from permits and extra revenue from an increase in people using its car parks.
The scheme has received a mixed response.
David Williams of Coleshill Terrace, Llanelli, has paid more than £200 in fines for parking outside his own front door, where there is a two-hour restriction.
He says he is delighted that residents-only parking is set to be introduced and hopes his street will be one of the first.
"Myself and other residents have been asking for this for years because at the moment you can't park outside your front door.
"Spaces are either taken up by people who don't live here or the traffic wardens book you because you are not allowed to stay for more than two hours."
But shopowners say they are worried over-zealous traffic enforcement could drive trade away.
A spokesman for the Llanelli market traders' association said: "We would not want it to get out of hand where people are afraid to even come to town for fear of being fined.
"There needs to be plenty of spaces for visitors as well as residents."