More on Tracking Licence Plates

http://viableopposition.blogspot.ca/2013/07/tracking-licence-plates-another.html

License plate readers are becoming ubiquitous in many nations including Canada and the United States.  They are essentially a high speed camera that is mounted on bridge overpasses, in police patrol cars and on posts along streets and highways.  These cameras capture an image of every passing license plate along with the vehicle, driver and front seat passenger and are promoted as being used to locate vehicles (and presumably their drivers) that are potentially guilty of a crime by checking the license plate numbers against a police "hot list".  They can also be used to track stolen vehicles and track people that have been registered as sex offenders or for such mundane legal issues as parking tickets.  The use of these systems is becoming increasingly widespread; in 2011, three-quarters of police agencies were using plate readers and it is estimated that within five years, plate readers will be installed on one-quarter of all police patrol cars.

Here is a video showing how effective these systems are at capturing your license plate numbers both at night and during the daytime: