A motorist in Tipperary has been caught speeding 171km/h in a 120km zone.
The incident happened on the M7 at Nenagh on National Slow Down Day yesterday.
Another motorist in the Premier was clocked at 68km/h in a 50 km zone.
They were among the worst-offenders of the 225 people caught speeding yesterday.
Gardai and GoSafe checked the speed of over 140-thousand vehicles during the 24 hour period.