[ricket]

A toll near me (NC) has cameras and an electronic sensor over the highway; it reads your pass if you have one, or takes a picture of your license plate if you don't so that they can mail you a bill later. (there are no humans, nothing to stop for)

When they first put it in, I noticed there are 3 or 4 of those in-road "buttons" (weight pads?) right in a row under the toll platform. They could be used to trigger the timing of the reader and camera, or I figured they could be used to determine speed quite easily.

So for a while after it was first put in, I would carefully hit my brakes and ensure my speed through the toll was right at the speed limit, then go back up to normal speed. But after a while I got lazy and stopped doing that, since nobody else appeared to be doing the same. "Everyone" was speeding through it.

I never received anything in the mail, and nowadays I rarely go through the toll. But now this article makes me think I could have been right, maybe they are recording speeds (or capable of doing so) and just doing nothing about it.