[Corrado]

Unfortunately, you cannot hide by obscuring your license plate. The ALPR system recognizes vehicles by type, color, and any outstanding features (bumper stickers, trailers, etc.) So, even if you removed your license plate completely they would still be able to track your car as a blue, 1999 Toyota Camry, with a "I love Peaches" sticker in the back window.

[ProllyInfamous]

You are correct. Although I drive a very common car/color, it is naïve to think that these systems aren't monitoring me as the grey sedan without visible license plate. I did remove the bumper stickers [0]

My local newspaper retracted a story this month about how the police were able to locate a certain colored vehicle within minutes. Perhaps it was too revealing for general consumption?

My "obstruction" is more (legal) protest? Better to just move to a de-flocked city/state..?

[•] https://xkcd.com/1105/ [License Plate Police]

[0] I consider this similar to how some property appraisal maps allow people to remove their names from searches (either through LLC or black-out), but you can still request beneficial owner information of specific parcels; just one/two additional layers of protection to throw off the scent (have to know what you're looking for, not just simple plate# lookup — although I'm sure there are aliases/forwarders in advanced CCTVai systems).