What is a benefit of using a helper when backing up a vehicle?

Using a helper when backing up a vehicle significantly enhances safety by allowing the helper to watch for obstacles that may not be visible to the driver. This is particularly important in larger vehicles, such as trucks or buses, where blind spots can obscure the driver's view of the immediate surrounding area. The helper can provide real-time feedback and guidance, alerting the driver to pedestrians, other vehicles, or obstacles that could pose a risk during the maneuver. The presence of a helper increases situational awareness and helps prevent potential accidents, making it a vital practice in safe driving, especially in complex environments like busy parking lots or urban areas.