The temporary measure will see one lane of traffic removed from Sandyford Road onto Main Street as far as the Lidl car park, creating extra space for pedestrians and cyclists.
Dun Laoghaire Rathdown County Council says it's aimed at providing a calm traffic environment and more space for pedestrians and cyclists.
A number of bus services will be re-routed.
Similar changes were introduced in Blackrock Village.
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8:00pm - 10:00pm
Love Songs on the Coast
Heavy rain shower
High: 16°C | Low: 10°C
Sunny intervals
High: 15°C | Low: 9°C
Sunny intervals
High: 16°C | Low: 9°C
Sunny intervals
High: 17°C | Low: 10°C
Sunny intervals
High: 17°C | Low: 9°C