On the road nobody can hear you, so groups talk with signals. Signals are usually given with the left hand, so the right one stays on the throttle. Each rider passes the signal back to the rider behind.
Left arm extended downwards, with the palm open towards the back.
Left arm extended to the side, palm down, moved downwards a few times.
Left arm raised, with the index finger pointing up. A stretch follows where you ride one behind the other.
Left arm raised, with the index and little fingers extended. You can go back to the zigzag.
You point to the hazard: with the left hand for the left side, with the right foot for the right side. Gravel, potholes, oil on the tarmac, animals.
You point to the tank with your left hand. Someone needs fuel at the next station.
For a rest break, many use a clenched fist, moved briefly up and down. For water or coffee: thumb towards the mouth.
Signals may differ from one group to another. Agree on them at the briefing, before setting off, especially if there are new riders in the group.
Other guides: Motorcycle gear · First group ride · Motorcycle check