What can happen if mirrors are not positioned correctly?

When mirrors are not positioned correctly, the primary consequence is decreased visibility of the road. Properly adjusted mirrors are essential for providing a clear view of the surroundings, including blind spots, which is crucial for safe driving. If mirrors are misaligned, a driver may overlook vehicles, pedestrians, or obstacles in adjacent lanes, leading to potentially hazardous situations. This lack of visibility not only affects the driver's awareness of their immediate environment but can also contribute to accidents and unsafe maneuvers.

The other options, while relevant to driving comfort and efficiency, do not directly address the critical aspect of safety that comes from having correctly positioned mirrors. Enhancements in passenger comfort, fuel efficiency, or communication with other drivers are not reliant on mirror positioning in the same direct way that visibility is.