Motorcycle Ride Etiquette

I was looking on line for some common hand signals for group riding. I assumed there must be something of the sort, since it's obvious that you can't yell from bike to bike at speed. In looking for these hand signals, I found quite a few web sites that showed the various hand signals. Some of them were similar to the hand signals we all learned as kids (left, right, slow/stop). There were many others as well, including pointing at the tank which means that you need to stop as soon as possible. The reason for stopping could be anything including a "bio break" or needing fuel. In doing a quick search for such tidbits of information, I found this to be the most complete:

http://njmc.org/etiquette/