[speeder]

I can guarantee that it's not "radar jammers" in big rigs. That's absurd. They would lose their livelihoods immediately when caught, (which would be extremely easy for LE), and they have no need for such a thing. I haven't seen a big rig going much over the speed limit in years.

Use your head for a minute.

The same reason that big rigs don't speed much anymore is the reason that your fancy toy doesn't work anymore. Constant GPS tracking and the signals that it emits. And yes, all of the adaptive cruise and other crap is just the cherry on top.