Comment by eru
Roads are not public goods.
> In economics, a public good (also referred to as a social good or collective good) is a good that is both non-excludable and non-rivalrous.
If you ever sat in a traffic jam, you will have experienced that road use is rivalrous. And toll roads show that it's rather easy to exclude people from using roads.
Building roads with general taxpayer money and making them available without payment by the users might or might not be good policy. I don't know. But roads ain't a public good.
Most roads are difficult to exclude. Most spend most of their time with excess capacity and are not rivalrous. They're clearly not a typical private good.
And they're usually a natural monopoly, too. Not to mention that the acquisition of land to make a road is often problematic.
Basically, there's a lot of reasons to expect market failure in a market for roads. That's not to say the only solution is for the government to provide them, but that laissez-faire, completely hands off solutions are probably not going to turn out great.