Any motorist caught speeding on the section of the M7, on which a lowered speed limit is in effect, could face a charge of dangerous driving.
A speed limit of 60 kilometres per hour is in effect between Kill/Johnstown and Naas South.
It will be in effect for the next two years, to facilitate the road's €110 million upgrade.
Kildare Gardai have revealed that a motorist was clocked on that stretch of road at 141 kilometres per hour.
Garda Audrey Sheridan says the charge of dangerous driving carries an automatic licence suspension