The 'default' limit has now reduced from 80 kilometres an hour to 60 kilometres an hour.
The changes came into effect at midnight last night in an effort to reduce collisions and road fatalities.
Slower speeds are also due to be brought in for built-up areas as well as on national roads later this this year.
People travelling in rural areas from today will see the changes in those speed limits on road signs nationwide.
Have Your Seen Elizabeth?
An renewed appeal has been launched amid concerns for her welfare.
Five Year Sentence for Man Who Threatened Tiglin Founder
Three and a half years are suspended, on condition the 40 year old attends all necessary medical appointments.
Wicklow’s Adam Harris Launches Greystones 'Same Chance Walk for Autism'
The Wicklow 2026 Same Chance Walk for Autism is taking place on Sunday 12th April. Have you signed up?
Wicklow Reflective Of Wider National Trends In Cooling Off Of Housing Market
Latest Daft.ie Quarterly report makes for interesting reading from a Wicklow perspective
Wicklow GAA's Feel Good Vibe Maintained As Minors Run Riot Away To Wexford In Leinster Opener
What a win for the Garden County's minors in Wexford last night!
6:00am - 8:00am
Light rain shower
High: 10°C | Low: 5°C
Sunny intervals
High: 10°C | Low: 5°C
Sunny intervals
High: 10°C | Low: 3°C
Light rain shower
High: 10°C | Low: 3°C
Heavy rain shower
High: 11°C | Low: 4°C