Good advice, Bonzo. Get out of the way; a report to the police could prevent a future accident. It pays to be meek in such situations.

A method I definitely do not advise is dealing with the nut. One case reported here, on a multi-lane, the guy was flashing lights and tail-gating. When it was safe, the "victim" changed lanes, then the nut pulled in front and applied brakes- the "victim" was not quick enough with his brakes, and clipped the nut, throwing his car sideways across lanes and into a roll. Could have been deadly not only for the nut, but for others as well. Unfortunately, the nut lived.