A new speed limit structure for motorists in the Dún Laoghaire-Rathdown County Council area came into effect today.
A pilot 30km/h limit scheme has been adopted in a number of areas in order to better match maximum speeds to local road conditions.
Several roads in Glencullen and Ballybrack have seen their speed limits reduced from 80km/h to 50km/h.
The main N11 route from Foxrock Church to Loughlinstown roundabout now has speed limit of 80km/h which is an increase in some sections.
Senior engineer with the council’s transportation department, Anne Devine, said: “The new speed-limit bye-laws include a range of measures which will improve safety for all road users, particularly those most vulnerable, and should help reduce the impact traffic has on the environment.”
“Having reduced road traffic collisions over the past decade by over 50 per cent, the council has committed itself to building on our road safety programme over the coming years,” she said.
