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> Unless you have a detachable tag, otherwise your tag ID will appear on every single major interception, with time, speed between blocks. Most of Tag will ship to your house, and/or auto fill by credit card once the balance is low.

In principle there's no reason the same thing couldn't happen with license plate readers in all but the most dense of traffic. The tags likely make it easier, but with plate-reader technology it should still be possible to do just using license plates.

They're probably not erased after a few years; these records have already been used for criminal investigations. Considering their utility, I'd be surprised if they were erased.

There are a few cases in the news; here's the first one that popped up on my search engine: https://en.wikipedia.org/wiki/Melanie_McGuire

The DC metro area performs its traffic tracking via old-fashioned cameras, license plate reading, and pressure sensors in the highway.

I don't really know what the linked story has to do with toll RFID tags or automobile tracking; I was expecting some kind of source that supported your claim.