[wagonman76]

Let's see how well they function in the great frozen north. Or how long they even stay in place after a snowplow.

I wonder how it accurately measures the vehicle speed. A 2000 lb car should produce half the force at the same speed as a 4000 lb car. But in either case, you have to hit it regardless. So assuming the speed measurement works properly, if you've got a low slung car or spoilers or whatever, you're going to suffer damage even if you're going the speed limit.

I avoid places with speedbumps as well. There isn't a single speedbump or speedhump I know of that you can drive over at the legal posted speed without damaging your car. You have to come to a near complete stop and crawl over them.