Phoenix has the automated speed traps, they are on the 101 loop where they’ve had problems with excessive speeds.
I’m not sure the 15 couldn’t use some.
My main problem with the red light cameras is they take in no account of the traffic situation. For example, I have a small touring car and a larger SUV. When in my little car, I’m very aware that I stop really fast however the Ford Expedition behind me with the driver on the cell phone can’t. It affects my decision as the light turn yellow.
