Over 500 vehicles were caught for speeding yesterday, as part of National Slow Down Day.
The fastest speed detected was 142 kilometres an hour in an 80 zone in Brownsgrove, near Tuam, in Co Galway.
The force is appealing to drivers to comply with speed limits - and save lives.
At one checkpoint in Galway city, one of over 1,300 high-visibility speed enforcement zones in the 24-hour operation, found 121 people exceeding the speed limit within two hours of getting under way.
Gardaí and the Road Safety Authority have urged motorists to slow down ahead of this bank holiday weekend.
Over the past five years, June Bank Holiday collisions have seen the number of people killed or seriously injured rise to 90.