M50 toll charges could go up to €3.20 per journey if the EU gets its way.
The European Court of Justice wants Ireland to charge 23% VAT on trips on State-owned motorways.
That means prices on the M50 and the Dublin Port Tunnel could increase by as much as 60 cent.
Verona Murphy from the Irish Road Haulage Association says it is not fair.
She said: "The recovery is not such that we can sustain what we have suffered in the recession, never mind anything that might levy us with increases in what we do.
"Every time there is an increase in something to do with transport, the consumer ultimately is the one who suffers."