The anti- speeding operation runs until midnight.
Motorists are being warned they are putting lives at risk by speeding and driving while distracted.
Over one hundred drivers have been detected breaking the speed limit so far on National Slow Down Day, with one caught doing 136 kilometres per hour in a 100 zone.
A Westmeath motorist has been recorded at 142km/h in a 120km/h Zone on the M6 in Athlone.
Offaly motorists were also caught through Gardaí speed checks at the 60 km/h zone outside Killeen National School in Rivertown in Birr.
One motorist was going 99 km/h which was 1.5 times the speed limit while the other motoris recorded at 83 km/h.
While in Portarlington this morning, 95 kilometers an hour was recorded in an 80 km/h zone.
Road deaths have fallen from thirty-eight people on this day last year to twenty-four so far this year.
Superintendent Eddie Golden, says not using a phone while driving plays a huge role in preventing serious and fatal collisions:
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