manufacturers of red-light cameras do not wonder, they have quietly made fortunes in the past 20 years.. more recently "mandatory license plate scanners at major bridges and toll roads" it seems. edit
Most US states do not have red-light cameras, and some that did, have withdrawn them. For example, see the Redflex bribery case, and other legal challenges.
YMMV in other countries: some are packed full of red-light and speed cameras, with phone-use detection expanding rapidly.
Most toll systems use different tech (e.g RFID), reinforced by plate readers to identify violators.
However, plate readers will always be a part of national security, and certain local law enforcement tactics.
Plenty of toll roads recognize number plates in Europe, but it may well be that it's easier to implement this system when there are typically only two or three plate designs per country, and they're generally all pretty much the same — black letters on a white or yellow background.
rapidly multiplying red-light cameras at every major city intersection here in California -- see San Diego County technology plan and others. Zero discussion of withdrawing any of them, quite the opposite -- "no public debate evident." Roughly one-in-ten residents of the USA live in California. Secondly, a trend of physical restriction for entry, exit and travel of whole portions of counties, via declaration of disaster from Sacramento.
