23 drivers - 3 of them in the South East - have been detected speeding during the first three hours of National Slow Down Day.
One of those was driving at 138 km/h in an 80 km/h zone at Ballykinsella in Waterford.
In Tipperary, a driver was clocked doing 110 km/h in a 100 km/h zone in Clonmel and a Wexford motorist was doing 63 km/h in a 50 km/h zone on whitemill Road.
Gardaí will be out in force clamping down on speeding until seven o'clock tomorrow morning.
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