Over 860 drivers will be fined and slapped with three penalty points after they were caught speeding during National Slow Down Day.
The operation kicked off at 7 yesterday morning and expired early this morning.
Gardaí say speed reduction enforcement has taken on a new sense of urgency amid an “alarming” increase in road deaths this year.
Some notable detections in Donegal include; a motorist travelling at 83km/h in a 60km/h zone in Burnfoot, another was clocked doing 119km/h in a 100km/h zone in Newtowncunningham.
Meanwhile, a driver was caught speeding at Magheracar, Bundoran at 99km/h in a 60km/h zone. A motorist was also recorded speeding at 77km/h in a 60km/h zone in Portnason, Ballyshannon.
Three drivers were caught speeding in an 80km/h zone in Glentogher, one travelling at 110km/h, 111km/h and 114km/h.