A driver on the N3 in Co Cavan was detected travelling at 136km/h in a 100km/h zone on this National Slowdown Day.
So far, members of An Garda Síochána, along with GoSafe Mobile and Static Safety Cameras, have detected a total of 106 vehicles travelling in excess of the speed limit.
National Slowdown Day runs for 24 hours from midnight on Tuesday night until 11:59pm on Wednesday night.
Other examples of high speeds detected include:
• 121km/h in a 100km/h Zone on the N11, Timmore, Newcastle, Co Wicklow;
• 117km/h in a 100km/h Zone on the N15, Coolcholly, Ballyshannon, Co Donegal;
• 97km/h in an 80km/h Zone on the R772, Clavass, Enniscorthy, Co Wexford;
• 95km/h in an 80km/h Zone on the R419 Derryvilla, Portarlington, Co Offaly;
• 93km/h in an 80km/h Zone on the R148, Ballynadrumny, Broadford, Co Kildare.
The aim of National Slowdown Day is to remind motorists of the dangers of speeding, encourage a national conversation on the impact of speeding, to increase overall compliance with speed limits in place nationwide, and to deter and detect those that are intent on driving at excessive or inappropriate speed, gardaí said.