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There would be minimal overhead, and instead of gaming the funds through a multi-tiered political process and bureaucracy, money would be allocated to necessary upkeep and maintenance only. No more sending money to Washington, with Washington then deciding how much it will send back and to whom. No more siphoning funds for projects (make-work or otherwise) that don't have anything to do with building new roads and keeping the ones already built in good order.
But the current setup is not likely to be altered because there's next to no outrage. People focus on the supposed machinations of "Big Oil" -- and give Big Government a blank check.
It doesn't make much sense, but that's the way it is.