Such rules include skating in single file except when passing or moving into the back of the pack, rotational "pulling" in the front of the pack to shield the rest of the pack from the wind, and signaling about road conditions, hazards and alike to skaters in the back of the pack. Single-file skating in a pack is mostly dictated by the need to minimize the impact of air resistance on the pack, thus shielding from the wind behind the back of the first person who is "pulling" the pack.
Such rules cover procedures such as gliding in a single line, except when overtaking or entering from behind, rotational "drafting" at the front to shield the rest of the pack from wind, and signaling about road conditions, obstacles, and similar factors to skaters in the rear of the pack. Single-file skating within a group is primarily driven by the need to reduce air resistance's impact on the group.