Update: 131 drivers have been caught speeding so far today, as the Garda slow down operation continues.
Gardaí and GoSafe have checked the speed of more than 55,000 vehicles since 7am.
One car was found travelling at 151 kilometres per hour on the N72 in Cork which is a 100 kilometre zone.
23 drivers have been detected speeding during the first three hours of National Slow Down Day.
One of those was driving at 181 kilometres per hour, on the M1 at Lusk in Dublin, which is a 120 kilometre per hour zone.
Gardaí and GoSafe have checked the speed of over 18-thousand vehicles since 7am.
Gardaí will be out in force clamping down on speeding until seven o'clock tomorrow morning.
National “Slow Down” Day from 7am on the 18th October - 7am on the 19th October 2019. The operation will consist of over a thousand speed enforcement zones across the country. We are appealing to motorists to please check your speed & support National "Slow down" Day. #SlowDown pic.twitter.com/rwFwusI2Ma— An Garda Síochána (@GardaTraffic) October 17, 2019
Almost 96,000 motorists were caught speeding on Irish roads in the first eight months of 2019, while 117 people have died so far this year.
In an effort to reduce the number of speed-related collisions and deaths, Gardaí have started National Slow Down Day.
The Gardaí say a 1% reduction in average speed will bring about a 4% reduction in fatal collisions.
276 drivers were found to be speeding on National Slow Down Day last year, while there's been a 15% increase in the number of drivers found to be above the speed limit on our roads this year. That amounts to over 96,000 detections so far in 2019.
From 7am this morning, until 7am tomorrow, there will be an increased Garda presence on the roads.
Chief Superintendent Paul Cleary from the Roads Policing Bureau is urging motorists to slow down.
"With the darker evenings and the wetter weather approaching, vulnerable road users such as pedestrians, cyclists and motorcyclists will be at a higher risk in the coming months," he said.
"That's why we're asking people to support National Slow Down Day and check their speed. Not only on the day but every day."