Gardaí say from now on, they will request proof of calibration certification when cameras are installed.
More than 1,800 fixed charge notices issued to drivers caught speeding in County Mayo are being revoked.
It's after a new static speed camera on the N17 was found to not be certified.
Gardaí say they noticed on the 12th of February the speed camera did not have a valid calibration certificate issued by provider GoSafe, despite it being standard procedure.
However, the camera was fully functional and accurately identifying offences.
1,871 fixed charge notices were issued as a result of motorists being detected speeding by this new camera between December 20th and February 12th, when the error was noticed.
Of those, 800 were paid with penalty points applied by that time.
Those motorists will be issued a refund, with penalty points removed where necessary.
The camera has since been certified and operational since February 14th, with 230 valid speeding fines issued since then.
GoSafe has confirmed certificates for all other cameras used at average speed and static locations are valid.
Gardaí say from now on, they will request proof of calibration certification when cameras are installed.

Man Appears In Court Over Alleged Assault On Woman Campaigning Alongside Sinn Féin Leader Mary Lou McDonald
Speculation Grows Over Micheál Martin's Future As Fianna Fáil Leader
Higher Fuel Bills This Month As Petrol And Diesel Prices Edge Up Again
Man (20s) Seriously Injured During Alleged Assault In Kildare Town Was Found Unresponsive At 3.15 This Morning
Tóibín: “ Extreme” Views Highlighted In Secret WhatsApp Groups Will Not Be Tolerated, As He Points To Diversity In Aontú
Gardaí Investigate Alleged Attack In Kildare Town
“And My Daughter Won’t Like Brown People”: Aontú Fires Kildare Youth Leader Over Racist Messages
Michael D. Higgins Congratulates Catherine Connolly Following Decisive Kildare Vote