Surveillance cameras mounted to read auto license plates and compile a database of where the cars have been. Typically at intersections, but could be anywhere. Highly invasive of privacy, IMO.
Flock is a company that produces the cameras and supporting infrastructure and programs. "Flock camera" is becoming a generic term like "Kleenex" or "Scotch tape" to include other makers of the cameras.
Okay so why would a gas station ⛽ and truck stop have this type of cameras when they all have CCTV already?