People who exceed the limit will get 3 penalty points.
Motorists are being advised about a new speed camera which will come into operation next week.
A 'Motorway Average Speed Safety Camera' will be in place in Co. Tipperary.
The camera monitor the average speed of a vehicle between two points, with an €80 fine and 3 penalty points for those exceeding the limit.
Although there's been a similar camera in place in the Dublin Port Tunnel, it's the first time one will be deployed on an Irish motorway.
Motoring and Transport Commentator Conor Faughnan isn't sure it will work:

"Memories We’ll cherish Forever": Friends Mourn Ryan Gibbons As Murder Inquiry Begins
DJ Carey To Be Sentenced On Monday - Barrister Pleads For Leniency Citing His "Stunning Fall From Grace"
Vape Users Bulk Buying Ahead Of New Vape Tax To Come Into Effect Tomorrow
Kildare Among Ireland’s Worst Counties For Illegal Fireworks Offences
BREAKING: Young Man Dies In Hospital Following Serious Assault In Kildare Town
Weekend Rail Disruptions: Bus Transfers For Kildare And Athy Commuters Amid Major Works
Death Notices And A Fake Undertaker: Three-Year Sentence For Woman Behind Elaborate Death Hoax