This is known in some places as "the Michigan system" and elsewhere as "common sense".
It may not be obvious for newer riders, so here is a quick rundown on how we run our trail rides.
We use the “Michigan trail riding system”
Typically the group is arranged fastest to slowest, as that's more fun for everyone, with an experienced sweep rider at the end for safety.
The lead and sweep riders know the route.
The lead rider sets the pace and break schedule that's fun/comfortable for the slowest rider in the group.
The sweep rider rides at a comfortable non-crashing speed, has basic tools, aid, and helps the riders at the back of the pack (typically least experienced) with issues.
You are responsible for the rider behind you, and that rider you is your first responder.
At every intersection - STOP.
Make sure the rider behind you is OK - even if it's the experienced sweep rider.
If the intersection is a turn, make sure the rider behind you makes the correct turn.
If anything weird happens - STOP.
If you get to an intersection and are not sure where to go (person in front of you isn't there) - STOP. Turn off your engine, listen, wait.
If you have an issue - STOP.
If you need to pee, need a break…etc… - STOP.
When the lead rider sees there is nobody behind them - they wait 5, then turn around and go back. Get the next STOPPED rider and both go back…etc… until the whole group is back together.
Avoid doing the following -
Leaving the group and riding back to the trailhead/camp without telling anyone. Even if you know where you're going, we’ll be in the woods looking for you.
Riding backwards down the trail to look for people - head on collisions are really gnarly. It's best that as few people do it as possible.
Trying to catch the rider in front of you to them to stop. They are likely faster than you. Just stop and do what you need to do.