Those are pretty interesting links. Thanks for sharing.

I wonder if there's any way to come up with a net value overall for those subsidies? For example, pre-K education is fully subsidized in some states and it looks like the total economic results over a long time are very positive. How would you go about figuring out if those road subsidies are too high or too low?

Good question, and a tough one.

You'd want to look at total benefits (easier movement of people and goods) vs total costs (environment, sedentary lifestyle health problems, wasted space in cities).