Drivers of many other high-end German cars too, and even some Saabs and Volvos, I think.
I know that if you are like most car owners, your Owners Manual is a kilo or so of dead weight in the glove box.
But would you please take it out at your earliest convenience - as in IMMEDIATELY AFTER READING THIS - and check in the Index to see if your car has a 'rear fog lamp'?
If so, please also read how to shut the bleedin' thing off!
(The one in this photo is actually in a Porsche Panamera Hybrid).
This feature - typically only one of them, embedded in the left rear taillight - is designed to be used on the German Autobahn, sections of which are subject to very thick fog.
At the speeds they get to drive over there, you need to give all the advance warning you can to faster cars which may be approaching from behind.
But being Germans, the drivers there are disciplined enough to ONLY turn them on when there is thick fog.
The other night - a perfectly clear night - I was passed by an aggressively-driven Mercedes-Benz SLK whose owner (like so many others) presumably did not know his car had this feature, and/or did not know how to turn it off.
Possibly, he just didn't give a damn, but I like to think positively, that it was merely ignorance, not arrogance.
The light was very blinding, almost as bad as someone driving behind you with his high beams on.
Typically, this function is activated by pulling the headlight switch out a notch or two. It's easy enough to do by mistake, and while it does also turn on an indicator light on the dashboard, all too many of us don't pay any attention to those either.
So be polite, and do the rest of your fellow drivers a favour, will you please?