If someone keeps their Twitter handle disambiguated from their personal life, is there a reason why they can't #followallthehashtags?
most traffic condition on map rely on Toll Tag to measure travel time and speed between points, on normal highway.
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.
People probably imagine they will be erased after few years, but $sudo happeneds.
http://www.dailykos.com/story/2015/08/17/1412811/-AT-T-and-N...
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.
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
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.