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Speed cameras are mentioned in another thread. In Minneapolis, cameras to catch red light runners were taken down, since the prosecutors couldn't prove that the car owner was the driver.
West Midlands Police (and all that needs to be said is that even the Met has more credibility......) used a police helicopter to chase down a young woman spotted committing the heinous offence of drinking from a bottle of water while stopped at traffic lights, thus presumably losing control of her vehicle by taking one hand off the wheel. Like you do when changing gear. Or applying the handbrake, which she had.