The hand signal for a change to double file will see the leader extend their left arm up at the elbow with their hand facing forward -- very similar to both "Follow Me" and "Single File" signals.

Wondering what it means when a biker bends their left arm down with the palm facing back? It's a common hand signal-here's ...

This signal involves a biker putting their left hand up with the palm facing forward. It's mainly shown by the leader of the group to signal other bikers to follow them. This gesture is mainly ...