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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Light rain shower
High: 18°C | Low: 11°C
Light rain shower
High: 19°C | Low: 11°C
Light rain shower
High: 19°C | Low: 9°C
Light rain shower
High: 17°C | Low: 8°C
Light rain shower
High: 19°C | Low: 8°C
