Not only is the road system problematic under the statist control, in order to make it supposedly effective the fed has to steal even more of my labor. You say there is demand for good quality roads? Then why not let the free market handle it in the first place. Problem solved and the government doesn't have to money from me at gun point. :O Also, the government has no incentive to be efficient due to the lack of profit incentive. Road costs could be a lot cheaper under a private system.

Private roads have been made the past, they can still exist today. Businesses want customers to access their storefronts easily so naturally roads will come about. Scew the government monopoly. Give the power to the people.