One was travelling at almost twice the limit.
11 drivers were caught speeding in Offaly during a two hour window yesterday.
Birr Gardaí monitoring drivers on the R440 through Killyon village said the majority of those travelling over the speed limit lived in the locality.
Two drivers were detected driving at 81 and 95 kmph in a 50 kmph zone.
A number of fixed charge notices have been issued.