I would be more amenable to this proposal if I knew the money wouldn't go straight to the state's general fund, as the gasoline sales tax (different from motor fuel tax) and local gas taxes already do.
But it doesn't matter for now--if by some miracle this managed to pass in the legislature, it would face swift and certain veto by our current governor.
Gasoline taxes account for 15% of highway spending in Illinois, according to the
University of Illinois Institute of Government and Public Affairs.