(Salem, OR) -- The Oregon Trucking Association and three trucking companies have filed a lawsuit against the state alleging they're over-charged for road use. A study by the state determined trucking companies are over-paying by at least 32 percent. ODOT is aware of the problem, but the Oregon Transportation Commission has failed to act on it. ODOT is already over budget on the cost of projects and if it reduces fees paid by truckers it would have to raise taxes on light duty vehicles, like cars and trucks. The lawsuit claims truckers are over-paying by 193-million-dollars a year.