More than 200 motorists were detected driving above the speed limit during a 24-hour national 'Slow Down' day, according to gardaí.
The 'Slow Down' operation ran from 7am yesterday morning until 7am this morning.
Gardaí and GoSafe said they checked the speed of 140,720 vehicles during the operation and 211 motorists were detected driving above the speed limit.
In Galway, two motorists were found to be travelling at 161km/h in a 120km/h zone at Thiar Órán Mór, while on the N25 in Ballyadam in Cork, a motorist was found to be travelling at 157km/h in a 100km/h zone.
Another motorist in Cavan was found to be travelling at 132km/h in an 80km/h zone on the N87 at Gartaquill Milltown.
Gardaí said the aim of 'Slow Down' day is to remind drivers of the dangers of speeding, which is a major contributory factor in road crashes.
A report from the Road Safety Authority found that between 2008 and 2012, excessive speed was a factor in almost one third of all fatal collisions.
During the last 'Slow Down' day on 28 February, gardaí and GoSafe detected 628 motorists speeding in checks on almost 174,000 vehicles.
Gardaí have appealed to drivers to comply with speed limits to reduce the number of collisions, to save lives and reduce injuries on Irish roads.