Originally Posted by Eastbay1K

In the USA, one would have an actual interaction with a police officer; i.e., pulled over, and written a citation.

The only exception to this would be the red light cameras (in certain jurisdictions, and due to issues with them, in declining use), which should get a picture of the driver and the car/plates.

The concept of getting a speeding ticket after the fact without warning is literally a foreign concept!