Gardai in Donegal Town stopped a driver doing 140kph in a 100kph zone last night.
The driver will appear at a future court sitting.
Meanwhile, Gardai from the Buncrana Roads Unit stopped a driver who tested positive for driving under the influence of drugs.
This driver will also come before the courts.
Gardai have pleaded with the public in Donegal not to drive under the influence and not to speed.