What about the roads?
I like to say, "We'll see." For now, let's shrink the state to a more reasonable level...at least let's become the most free country on earth according to the indices.
Let's deregulate the economy to the levels of Denmark, New Zealand, Canada, and Hong Kong, bring banking to someplace like Switzerland, maybe look to the Swiss and Singapore for our health care issues, cut defense, end mass incarceration, change the war on drugs from the mad Jihad that it is into to a medical problem that it ought to be, and so many more things...and yeah, let's get taxes as low as we can get them, and start switching them from intrusive invasions of privacy like the income tax, to fees for services and things that are already regulated through commerce law.
Things like that are my priorities. After we've solved all those problems, then I say we can worry about the roads.
For now, let's just not spend infrastructure money on boondoggles, and who better than Libertarians to know a boondoggle when we see one?