 People who tailgate could be doubling your commute, according to researchers at MIT, which sucks. But until we can convince everybody to back off, here's the best way to deal with them. Don't break check. In some circumstances, you can be held liable if break checking results in an accident. Let them pass. Pull over if you can, or get all the way over to the right on a multi-lean road. Check your speed. If you're going under the speed limit, speed up to a reasonable and safe speed. But do not tailgate the car in front of you. That will only make the situation worse.