When traveling in a group, the riders should never ride:

Answer: D — Three or more side by side

Riding two or more motorcycles side by side is not advised due to several safety concerns. This formation can restrict the maneuverability of riders and make it more challenging to react to hazards, especially in tight spaces or when needing to make sudden stops. In addition, it increases the risk of collisions both within the group and with other vehicles, as wider formations occupy more of the lane and may be more difficult to manage in traffic. In contrast, riding in a single-file arrangement allows for better visibility, easier navigation of road hazards, and improved protection against wind blast, which is particularly beneficial when motorcycles are traveling at higher speeds. Riding in pairs may also be acceptable under certain conditions, but it's essential to remain aware of the surrounding traffic and ensure that spacing allows for safe stopping distances and maneuverability.