[Christ]

It probably records speed some distance ahead with a laser speed detector. Relying on force to deduce speed is very unreliable. EDIT: Yup, it's very unreliable... and they're still going to use it that way. No laser detector.

Trailer park I used to live in, a bunch of the residents got upset over a speed bump being installed in the main driveway. They began going the wrong direction up the one-way road to avoid it. I did the same, because my vehicle would get stuck on the speed bump. It was like 10" tall, with no obvious regard to grade transition. My car had less than that for clearance, by far.