As I stated a few posts back, imagine the joy of staying current with each road owner's differing set of policies, regulations, requirements, monitoring equipment, contracts, and so on. Imagine how much fun it would be to research the different policies and fees, and staying abreast of changes due to change in ownership, and so on. You too can live the libertarian dream.
How is this any different than my house "rules" vs. your house "rules" vs. everybody else's house "rules"? Now come to think of it (light-bulb-turning-on-moment), drum roll... There ought to be a law... Sheesh.