We have private fiber networks which cross state federal and international boundaries. How are they paid for?
How do cell networks get the billing right despite you traveling from tower to tower under different ownership?
What's the percent of automobile users which have a cell phone or a GPS device? Probably higher than EZ pass owners. This GPS information is used to update google maps traffic patterns and there is no reason a private company couldn't use it with your permission to give you discounted mileage on a network of road ownerships.
Examples of private roads exist today. Disney is one example and Chicago was built privately. They are always better built and maintained when there is a direct financial connection to the customer. Arguing for some socialization is always pissing into the economics winds because you have no imagination.