Speed limits of 30kph will be enforced across Dublin city if the current slow-zones around the capital prove to be a success.
Dublin City Council (DCC) hopes that, in the next few years, the entire city will be subjected to lower speed limits.
Non-arterial areas in Dolphin's Barn, Smithfield and Kilmainham were among the first to have their speed limit reduced to 30kph.
The measure was then extended to residential zones in the wider Dublin area in May.
These included Sandymount, Drimnagh and Crumlin before extending to areas covering parts of Glasnevin and Cabra.
After investing €340,000 into the scheme, the council has been looking at the city's arterial routes for next year.
Dermot Stevenson, senior engineer with DCC, said that any expansion to the scheme will not be done on an "ad hoc" or "willy-nilly" basis.
"Obviously, we have to go through public consultation, compare reports, listen to councillors and lobby groups," he said.
"It takes a lot of time and effort when planning where you're going to introduce these slow-zone areas.
"In 2018, we'll definitely look at the arterial routes. If the results from the first two phases come back hugely positive, then we'll look at expanding this initiative."
Mr Stevenson added that it will take a year or two before seeing if the slow-zone areas introduced this year are a success.
"By then, hopefully, the scheme will have expanded," he said.
"We're looking to get the full city involved over the next number of years - 85pc of the people we surveyed are satisfied with the introduction and 89pc said they would be opposed to reverting to a higher speed limit in their area."
The Road Safety Authority (RSA) announced yesterday that Ireland was falling behind Europe in setting 30kph speed limits in cities and towns.
At its annual Academic Road Safety Lecture, the state agency urged local authorities throughout the country to introduce more slow-zones.