i was just using one example, but i will say that people won't pay for stuff they won't tolerate
that's fine on a small scale, but when you start having major roads that people
have to use in order to get to work every day, this gets muddy. it's also hard to know how well privatized roads scale up to the size of infrastructure we have. there are also a lot of roads that are definitely not profitable to maintain, but are definitely essential for the people that live in non-urban areas. i think that a mix of public and private roads would be better than being fully private, and i think there definitely would need to be oversight of the companies that make roads to make sure that they play nice together, follow standards of what a road should be, and don't abuse the fact that people would literally need to use them
ultimately tho, public roads are absolutely an economically sound investment for government to make for somewhat obvious reasons, and having free access to the road network helps both businesses and consumers.