So, a bit of a side rant here, but this is the tip of the iceberg.
* We know that these photos are collected and stored for an indeterminate amount of time
* We know that license plate readers are deployed in many fixed locations, as well as most patrol cars.
* We know that police have the ability to scan license plates real time, as anyone who has been busted for missing their emissions can tell you (not most people, but yes, I forgot my emissions, and my license plate was scanned as I was doing 70 mph on an 8-lane highway, and I got pulled over for it).
* We have public (garbage trucks in DC) and private entities (Not just airport authorities) scanning and recording licenses and location data. How do they use that data? How long do they store it?
* Red light cameras. I'm not sure how to approach this. We have been told that the data is only stored for violations, yet when FOIA requests have been fulfilled, such as the one for Metro Bus violations, it turns out that video has been saved for years, despite no violation being reported.
* And in DC, we have a program to include private cameras in the government surveillance network.
I'm not against most of these, but there is no public policy regarding any of this. It's the wild-wild-west of digital surveillance.