What could be a sign that another driver is about to change positions on the road?

The correct choice is signaling a lane change. When a driver uses their turn signal, it is a clear indication that they intend to change lanes or turn. This action is a form of communication to other road users, including motorcyclists, about their upcoming movements. Recognizing this signal gives you the opportunity to prepare for their change in position, allowing you to maintain a safe distance or adjust your own positioning accordingly.

Other behaviors, such as driving steadily without changing speed, could indicate that a driver is simply maintaining their current course, which does not provide an indication of an imminent lane change. Looking at their phone usually suggests distracted driving, which does not give any reliable clues about their intended actions on the roadway. Maintaining a large distance from other vehicles may be a way for a driver to ensure safety, but it does not directly signify an intention to change lanes. Understanding the significance of signaling can be critical for safety and awareness while riding.