Carlow Roads Policing Unit detected drivers travelling at speeds of 187km/h and 171km/h over the Bank Holiday weekend.
Gardaí said: "No excuses for speeds like this. Nine people lost their lives on roads so far this October...let’s not add to this tragic number. Drivers slow down and arrive alive."
Subscribe or register today to discover more from DonegalLive.ie
Buy the e-paper of the Donegal Democrat, Donegal People's Press, Donegal Post and Inish Times here for instant access to Donegal's premier news titles.
Keep up with the latest news from Donegal with our daily newsletter featuring the most important stories of the day delivered to your inbox every evening at 5pm.