The speed limit in Dublin's Phoenix Park has been slashed from 50km to 30km per hour.
The new speed limit will come into effect on February 28.
Two major changes to the roads in the park are also being implemented that day.
The North Road will be turned into a one-way system, and a cul-de-sac on the Upper Glen Road will be implemented.
These changes will be in place for a nine month pilot study, and are in line with recommendations made in last year's Phoenix Park Transport and Mobility Options Report.
Minister of State for the Office of Public Works, Patrick O’Donovan said the change in speed limit "should see a marked change in driver behaviour".
He said: “Following an extensive public consultation process, the Phoenix Park Transport and Mobility Options Study Post-Consultation Report was published last year with a number of key recommendations, which I am delighted to see being implemented.
"The reduction of the speed limit from 50km/h to 30km/h should see a marked difference in driver behaviour, making the Park a safer place for all of us using it for recreational purposes.
"The effect of the two pilot projects on the North Road and Upper Glen Road will be closely monitored by the OPW and we welcome any observations the public have in their regard."
He added that the Office of Public Works has installed 40 new bike stands in Phoenix Park.
“Cyclists will be pleased to hear that traffic lane separators for the entire length of Chesterfield Avenue will be installed this month and over 8km of cones currently in use removed.
"These new durable and strong dividers will ensure a safer experience for both cyclists and vehicles using Chesterfield Avenue, while my team works with the National Transport Authority and Dublin City Council on the design of the new permanent cycle lanes linking Castleknock to the city.
"The OPW has also installed over 40 new bike stands throughout the Park, with an additional 70 planned in the coming months.”
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