When backing a large truck, what is the recommended safety measure?

Having someone guide you when backing a large truck is the recommended safety measure because it enhances visibility and situational awareness. Large trucks have significant blind spots, making it difficult for the driver to see obstacles, pedestrians, or other vehicles behind them. A guide can provide vital information about surroundings, ensuring that the driver can navigate safely without risking damage to the vehicle or injury to others.

Using mirrors alone may not provide a complete view of what is behind the truck due to those blind spots. Turning on hazard lights can be helpful for alerting others, but it does not address the issues of visibility while reversing. Backing up quickly is not safe, as it reduces the driver's ability to react to unexpected hazards and increases the risk of accidents. Therefore, having a guide is the most effective way to ensure a safe backing maneuver.