More than 2,200 drivers have been caught speeding during the most recent road policing operation, with one motorist caught travelling at 206km/h in a 120km/h zone on the N6 in Ballinasloe, Co Galway.
Gardaí conducted an operation on roads over the bank holiday weekend.
It began at 7am on Thursday and ended at 7am yesterday.
Another motorist was caught driving at 142km/h in an 80km/h zone on the R512, Bruff, Limerick.
While in Knock, Co Mayo, a driver was detected travelling at 166km/h in a 100km/h zone on the N17.
During the operation, gardaí put in place high-visibility checkpoints and conducted statutory mandatory intoxicant testing.
Gardaí said under 200 drivers were arrested on suspicion of driving under the influence of alcohol and drugs since last Thursday.
However, four people died on roads while the operation was in place.
Fifteen people have died on roads in the Republic and five other people have been killed on roads in Northern Ireland so far this year.
