Yeah, we're not that sophisticated up here.
I was driving with my family to the Florida Keys (hey, about that trip !!) several years ago, and went on a bypass around Miami, and was wondering what they do about all the tourists.
A few weeks later I received a bill in the mail that had the toll, plus a 50 cent "convenience fee".
Still must have the transponder up here. It's a conspiracy of the eastern seaboard. The transponders are good in a bunch of states east of the Mississippi.