Dublin City Council's contacting drivers who were illegally clamped in the first seven months of this year.
They were immobilised even though there weren't the correct road markings.
The 26 cars illegally clamped had been parked between Longford Street and Noel Purcell Walk, between January and July.
Signage and street markings had been removed to put in an additional traffic lane as part of Operation Freeflow.
Even though they hadn't been re-instated, Dublin Street Parking Services clamped the cars anyway.
In a statement to 98FM News, DCC revealed "this matter was drawn to the attention of the City Council at a meeting between a concerned member of the public and the Chief Executive. The Council is in the process of contacting the registered owners of the vehicles clamped at this location and at two other locations, to apologise for the clamping of the vehicles and to make arrangements for a refund."
The local authority also says it has written to clampers, telling them not to immobilise drivers where road markings or street signs aren't clearly legible.