Naas's Rathasker Heights is one of the affected estates.
Kildare County Council is set to commence the installation of Slow Zone signage in more than 20 residential areas throughout the county.
The move follows the establishment of Jake's Law last Wednesday, November 23. The law is named in honour of six year old Jake Brennan who was killed after being knocked down by a car near his home in Lintown Grove, Kilkenny in 2014.
The effect of the new law is to reduce the speed limit to 20kph in the affected estates. The first estates are the first phase to be changed. The council will continue the programme in 2018 following assessment of areas currently underway as part of County Speed Limit Review. Funding for this programmes is being provided by the Department of Transport.
The move was welcomed by Deputy Bernard Durkan.
The affected estates are Castle Village and Abbey Farm in Celbridge; Ryevale Lawns, River Forest, Oaklawn, Cedar Park and Rinawade in Leixlip; Liffey Hall and Standhouse in Newbridge; Pomeroy Park in Rathangan; Carton Court, Straffan Woods and Railpark, Maynooth Park in Maynooth; Liffey Lawns in Clane, Brayton in Kilcock, Sarto Park, Rathasker Heights in Naas; Laurel Wood and Castlemartin in Kilcullen,