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These are pretty good responses. Making me wonder about the damage state-funded roads have done to our urban planning. Why can't I get to the coffee shop on a zipline? Sounds like a jest, but it's honestly a version of "Where's my flying car?" Why don't we have awesome pedestrian bridges and all the rest? Because largely we don't. And what kind of building have we not even considered because of this.
I think about the damage (distortion) of heavily subsidizing roads a fair amount.
There was a study a long time ago that estimated the opportunity cost of streetside parking (in NY, iirc) was similar to the entire expense of their welfare programs. There really should be far less car traffic in dense urban environments. It's a wildly suboptimal use of space.
You're absolutely right that some roads will be of low quality and I have no intention of pretending privatization = perfection.
However, here are some reasons why outcomes might be better than the status quo (remember that bureaucrats have no/little skin in the game)