How's my driving in front

On my way to work today, I was driving in front of a couple of commercial vehicles, the kind that might have a sign on the back: "How's my driving? Call 800-xxx-xxxx." These commercial vehicles weren't really too bad; they got a little too close but not scary close. But I was thinking that it might be nice to have those "How's my driving" signs on the front so someone could report a commercial vehicle that was a really bad tailgater.