Toll roads are a bit different, aren't they...you're renting them. Like the difference between a hooker and a wife.
Now...the wife is like a public roadway. No matter how much stuff you buy them, they still make you think it's a privilege to provide any friendly favors. Try telling your wife you have a "right" to git sum.
You are most welcome.
Seriously, the roadways are regulated under the state's "police powers" and therefore not open for use as a matter of right. Same goes for licensing.