Which of the following is a reason to use a helper when backing up?

Using a helper when backing up is particularly valuable for avoiding blind spots. When a driver is reversing, visibility can be limited due to the vehicle's size and structure, which creates areas that the driver cannot see. A helper can be positioned outside the vehicle to provide visual cues and guidance, alerting the driver to obstacles or other vehicles that may not be visible in mirrors or directly through the windows. This collaboration significantly enhances safety and helps prevent accidents.

While the other options may involve important vehicle operations, they do not directly address the primary function of a helper in this specific context. Parking assistance and traffic management can be beneficial, but avoiding blind spots is the crucial reason to use a helper when backing up, as it directly affects safety during this maneuver. Adjusting mirrors is also not related to the immediate need for assistance while reversing; it’s something a driver can do independently before starting the backing process.