Honestly I'm not sure, we had circular sensors for a long time, about the size of a tall drinking glass, now there's rectangular sensors they just put up about twice the size of a cell phone and they have a bend, arc, to them, I know they weren't being used as cameras at all before, no one was getting tickets with pictures from them, it's a small town. What exactly the new system is I'm not sure, our local news all went out of business, so its all word of mouth, or going to town hall meetings.

I'm guessing it's some sort of image recognition and maybe some sort of switch under the pavement telling the light when a car has rolled up.