It’s really unfortunate, and for some reason cops seldom write tickets for tailgating. They are overly fixated on speeding tickets, no doubt as a source of revenue, but I digress.
When an idiot is driving too close behind me, what I do is to gradually slow down, at some point the moron gets the message and changes lanes. I also make sure that I’m not in one of the faster lanes, because if I were, then I’d be the moron…