The UK/Ireland guys had a good topic going regarding etiquete. Wave? Nod? Thumbs up?
Question: How to you let other riders know that the police are on the stretch of road you just came off of?
On my local mountain twisties the standard seems to be thumbs up for a cop free road and a pat on the top of the helmet to warn that the man is just around the bend.
Just so no one slams me for being a cop hating scoff law let it be disclosed that I am a police. I happily let brother bikers know when my blue brothers are lurking. Hmm. I guess that makes me a hipocritical scofflaw.
My personal favorite greating is very traditional. Thumbs on the sides of the helmet, all fingers waggling, tongue sticking out.