Told you so: red light cameras for surveilance
For all those people who predicted that red-light and speed cameras would be used to track vehicles: you're right.
Private companies in the US are hoping to use red light cameras and speed cameras as the basis for a nationwide surveillance network [..] It allows officials to keep full video records of passing motorists and their passengers, limited only by available hard drive space and the types of cameras installed. To gain public acceptance, the surveillance program is being initially sold as an aid for police looking to solve Amber Alert cases and locate stolen cars.
Welcome to the Fourth Reich [wikipedia].
In the UK, officials are planning to dramatically expand the use of average speed cameras that track cars over distances as great as six miles. Records on all vehicle movements taken from a nationwide network of cameras will be stored for five years in a central government Automated Number Plate Recognition (ANPR) server, allowing police to keep tabs on criminals and political opponents. Work on the data center in north London began in 2005 and officials expect real-time, nationwide tracking capability to be available by January.