I was driving home from an IHOP, and I had no warning on my RADAR detector (8500 x50 S7 Red), but I knew where cops like to hide and park from past experience. They wait with their RADAR off and usually shoot sloppy I/O, so I usually get a blip here or there letting me know something is in the area.
As I approached this area, a motorist on the other side of the divided roadway (2 lanes in each direction 40 mph limit... artificial) flashed his lights off, on, off, on twice, so I suspected the police. Anyway, there was a white Dodge charger with all his lights off in a private parking lot facing onto the road just waiting to I/O a speeder... Freaken A**H**
Anyway, I was fine and would have probably been okay anyway due to past experience, but I thought it was really cool of this driver to warn motorists. As I passed this area I entered a left turn-lane and saw a wolfpack of cars approaching, so I dimmed my headlights twice to signal the on-coming cars. Hope someone else was as happy as I was that night.
I will ALWAYS dim my lights to signal other drivers because I am tired of this sneaky hiding fluff they do. I know this officer saw me dim my lights twice too, but he didn't do anything about it... should he have acted, I would have taken it to court demanding a jury trial.
Too bad I don't know who this observant, other driver is who signaled me. If I met him in public... dinner and beers would be on me for the service he is rendering the public... nice to know there are good people out there.