UK we have had speed cameras for ages. There was a trend for people to either spray paint the lens or even firebomb the camera. So they had to put in a second (video) camera mounted as high as possible to protect the first camera, quite amusing that a safety camera has to be kept safe by another safety cameras, its cameras all the way down.
Personally I think speed cameras that monitor a fixed point are pretty dumb unless that fixed point is an accident black spot such as outside a school or a red light camera for dangerous set of traffic lights. Its far better to have average speed cameras for a large section of road but those are more costly as you need way more cameras to make them work outside of motorways as you need to cover all the junctions properly.
Latest cameras we have in testing can see if you do not have your seat belt done up or are using your phone. Just stopping people from using their phone has to be the biggest step forward we can make with modern road safety.
Thanks for your contribution!