They already do/will be able to do so.
In my part of Florida, they are going to have toll lanes that will allow you to move faster than the others that decide to stick to the free portion of the highway. At least what will stay "free". Not that I see enough room in the current right of way to create these special lanes, certainly not on the inside berm.
This area used to have a number of toll roads and especially bridges. We pay a .5% sales tax to get rid of it. And now, they are bringing them back. I fully expect that they will have to rescind that tax increase before this will ever be palatable in this area, which will also cause issues because the politicians certainly are counting on keeping that sales tax in place.