What should you do before backing up your commercial vehicle?

Answer: A — Look in all directions

Before backing up your commercial vehicle, looking in all directions is crucial for ensuring safety. It allows the driver to assess the environment around the vehicle and identify any potential hazards, such as pedestrians, other vehicles, or obstacles that may not be visible in mirrors alone. This comprehensive visual check is an essential component of responsible vehicle operation and helps prevent accidents. The other options, while they may seem relevant, do not provide the same level of safety. Sounding the horn continuously could be disruptive and may not necessarily alert others to your vehicle's presence effectively. Accelerating briefly before reversing could lead to a loss of control, increasing the risk of an accident. Relying solely on the right-side mirror limits visibility and does not account for hazards that could be present on the left side or behind the vehicle. Thus, a complete visual assessment in all directions is the best approach for safe backing maneuvers.