Councillors have voted to keep charging drivers to cross the East Link bridge when Dublin City Council takes control of it next year.
A Dutch company currently operates the bridge, but the council will get full ownership once that contract finishes at the end of 2015.
Councillors were told at a meeting last night that the tolls could generate €4m a year in revenue.
However, Conor Faughnan of AA Ireland said the toll was not a fair way to raise money.
"This is deeply disappointing," he said. "I don’t think there's a single good reason for the council to do this, other than that they can.
"This is straightforwardly an exercise in taking money out of the pockets of motorists, because they feel they can do so."
Current tolls on the East Link are between €1.75 for cars and €5.20 for large commercial lorries.