Why is using a helper important when backing up?

Using a helper when backing up is crucial primarily because of the blind spots that can obscure the driver's view. Large vehicles, such as trucks and buses, often have significant areas around them that are not visible from the driver's seat, making it difficult to safely navigate in reverse. A helper can observe these areas and communicate any potential obstacles or hazards that the driver may not be aware of, ensuring safer maneuvering and reducing the risk of accidents.

While having a helper provide verbal instructions can be helpful in guiding the driver, the primary concern when backing up is the visibility issues created by blind spots. This makes the assistance of another person particularly valuable in maintaining safety during the backing process. Additionally, monitoring fuel efficiency and assisting with loading cargo are not relevant to the immediate concerns of backing up safely.