Look to Sydney, Australia, if you want to see where this is heading, as Sydney is completely tied up with toll roads. On the point of them being regressive, the NSW government has been forced to reduce political pressure by capping annual toll expenditure with a government funded rebate system.

It's no coincidence that the companies behind the expansion of US toll roads are mostly the Australian companies that run Sydney's toll roads: Transurban, Macquarie, IFM, ...