Re: "ignored most of the time"
The readers automatically scan the plate number of EVERY vehicle in front of them
Not just USA. When I drive across Europe the state of affairs is:
UK - In theory, a nation under ANPR. In practice, the smaller roads and small cities are not covered
NL - well, the birthplace of GATSOMeter corp, shall we say more
DE, CZ, A - All motorways, supposedly for toll enforcement. They read all plates, unclear what they do with them
Hu - All motorways, road tax enforcement, considering the inclination of the government there ....
Ro - A camera here and there for road tax enforcement, not even close to rest of Eu (they are surprisingly law abiding down there).
Bg - All A roads and all motorways, supposedly for road tax enforcement which interestingly enough is not done. So god only knows what is done with the data.
Greece - what camera? Camera? You expect a country which did not even have a national birth register till less then 5 years ago to have working ANPR? You mean someone will pay tax? You are joking, right.
E - I have not noticed any cameras, but that does not mean there aren't any.
F - camera at every toll and by god, they have more tolls than USA.