Proposed increases in road tolls are "far too high", Minister for Housing Darragh O'Brien has told the Dáil.
He appealed for those who are increasing the tolls to "reflect on their proposed increases and not to proceed with them".
The toll charge changes will come into effect from January.
Minister O'Brien told Sinn Féin TD Pearse Doherty that the flow of traffic at the port tunnel is not working as it should and noted the increase of €1 for peak times.
However, speaking on RTÉ's Morning Ireland, Communications Director with TII Sean O'Neill said that most people using the M50 will not be affected by an increase in tolls.
Mr O'Neill explained that 85% of people using the motorway have a tag or are registered with the TII.
These people will not be charged the 10 cent increase that will apply to those who are not registered.
He recommended that everyone registers for a tag if they want to avoid the extra charge.
Mr O'Neill said toll increases happen on an annual basis, based on consumer price index.
"If there is an increase in inflation, it impacts upon the agreements we have with toll operators around the country," he said.
"Unfortunately, there are some increases, but the vast majority of people are not going to be impacted."
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Mr O’Neill said that port tunnel rates are being increased to try to change behaviour.
He explained that the tunnel was built for HGVs to get goods and services out of Dublin Port. However, they are now seeing an increase in cars using the tunnel during the morning peak.
Mr O’Neill said money from the M50 and port tunnel charges is used to maintain and operate the facilities.
Other operators are private and have arrangements with the State, he said.
