Well, I did some digging around----in 2012, Congress passed a bill to have all the toll roads accept one pass. This was to be implemented by 2016. This was extended 4 years.
The various agencies involved apparently can't let go of the power they each have, so the "law" passed to bring all us commoners an easy way to travel has just been forgotten about.
If a cell phone caller can find my phone anywhere in the U S from anywhere in the U S, it seems a transponder attached to a windshield shouldn't be a big deal.
O.K. I'm done with my rant.