Letterkenny Roads Policing Unit detected a vehicle travelling in excess of 80KPH in the confines of the town and within a 50KPH zone yesterday.
The vehicle was stopped and the driver was then arrested on suspicion of drug driving.
Court proceedings will follow.
“Do not take risks on the roads. Slow down and never drive while under the influence of drugs/alcohol,” a spokesperson for Letterkenny Garda Station said.