> But the toll roads thing, again...that has little to do with "having drivers take ownership of the costs they produce". It's just social engineering via taxes, because people will avoid those roads, and drive on other ones instead.

Toll roads are direct use tax on using that infrastructure. 100% of roads being toll roads that cover their own costs is the libertarian ideal, isn't it?

Which roads will people take instead, if all roads into Manhattan have tolls?

And I agree it is social engineering. Those aren't mutually exclusive concepts. What reasons would a city have for wanting to encourage people not to drive or park in sections of that city? Perhaps there are negative externalities of that car traffic that they want to reduce. Why is social engineering via levying costs not a valid way to handle that?