Cork city is going 'car free' for the first time, in the hopes that the city can be more widely pedestrianised.
Deputy Lord Mayor of Cork Colette Finn said a majority of people there want to see changes.
The city centre will be closed to traffic from 12 noon to 6.30pm on Saturday.
Ms Finn told Newstalk Breakfast some areas are used to it already.
"The Quays will be open to traffic as normal; street closures will just be what is called The Marsh area," she said.
"We are actually already used to what's called the 'pana ban' in Cork, where from 3pm to 6.30pm private cars are not allowed travel along Patrick Street in order to facilitate public transport.
"It would be Patrick Street, Cornmarket, Castle Street, Adelaide Street, North Main Street."
'We do have to take action'
Ms Finn said those who need access will still have it.
"Deliveries will already have happened, because they tend to happen up to about 11.30am every day," she said.
"Taxis, buses, hackneys and blue badge holders - people with a disability - they are allowed to travel."
Ms Finn, who is a Green Party Councillor for Cork City South-West, said she is hopeful to make Cork more pedestrianised.
"We looked at all of people and we said, 'What can we do?' because we do have to take action on climate change," she said.
"We produce a million tonnes of carbon dioxide per annum here in Cork, and one-third of that comes from transport.
"We commissioned a study and that revealed that two-thirds of people in Cork strongly agree that Cork must transform into a more sustainable place, and that six out of seven Cork people would actually like more pedestrianised streets," she added.