Almost 600 drivers will be fined after speed vans clocked them going over the limit around the country on Friday.
One M50 driver hitting 170km/h on the 100km/h limit road was the worst offender with 585 in total set for a fine for speeding.
The vans recorded 121,000 vehicles for their speed throughout Friday with the vast majority abiding by the rules of the road.
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But many drivers who were over the limit and were unaware they were being watched by a speed van could be in for an expensive surprise.
A garda spokesperson said: "Yesterday, our Road Safety Partners GoSafe monitored over 121,000 vehicles across the road network. 585 Drivers were detected for speeding and will be issued with Fixed Charge Notices.
"The highest speeds detected, per speed limit zone, were:
- 135 Km/h in 120 Km/h M6 Kilcurley Moate Offaly
- 170 Km/h in 100 Km/h M50, Tymon North, Dublin 24
- 135 Km/h in 120 Km/h M7 Meelick Portlaoise
- 84 Km/h in 60 Km/h Finglas Road, Dublin 11, Dublin
- 110 Km/h in 80 Km/h R265 Cuttymanhill, St Johnston, Donegal
- 93 Km/h in 50 Km/h Arden Road, Tullamore Offaly
It comes as fines are about to be upped for all dangerous driving offences.
Minister Naughton said evidence from the Road Safety Authority shows that a number of fatalities on the roads are as a result of people speeding, using mobile phones while driving, and not wearing seat belts.
She told RTE: "But this year alone, over 100,000 of these offences were committed, so this is simply not acceptable.
"What I want to do is to bring in a measure with almost immediate effect, to increase the fines which will act as a deterrent for people on the roads, particularly in the month of August - a very busy month where people are holidaying, we have a lot of tourists visiting Ireland.
"There's more schoolchildren out and about, and we're asking people to slow down on our roads and to be extra vigilant, particularly for our pedestrians, cyclists, and vulnerable road users."
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