Comment by fps

The US's anti-surveillance laws and sentiment keep ubiquitous camera systems from existing in many places, and keep the ones that do exist, quiet. In my state, Massachusetts, traffic cameras legally cannot be used to issue citations. Automated toll collection, which uses highway mounted plate scanners, faced substantial backlash from people for privacy reasons. And Massachusetts is one of the least anti-government states in the country. If it got out that the police were monitoring which cars were on the road and how often they were driven, there would be literal riots.