In which of the following situations should riders move to single file?

Moving to single file in certain situations is essential for maintaining safety and ensuring clear visibility. Situations such as passing, entering or exiting, approaching corners, and in instances of limited visibility can create potential hazards for motorcycle riders. When riders are in a staggered formation during these circumstances, it can lead to confusion or obstructed views, potentially increasing the risk of collisions.

By switching to a single file formation, they can improve their line of sight, reduce the chance of overlapping movement, and ensure that each rider has adequate space to maneuver safely. This also helps in clearly signaling intentions to other road users and minimizing the risk of accidents that might occur due to sudden stops or turns.

In contrast, standing still at a red light does not necessitate changing formation since the riders are not in motion and can maintain their positions safely. Riding on straightaways allows for staggered formations to be used effectively without obstructions, and during group formation riding drills, riders typically practice specific formations rather than adjusting to single file unless directed.