How can you minimize the risk of rolling back on a hill?

Minimizing the risk of rolling back on a hill is crucial for maintaining control of a vehicle, especially when operating a commercial vehicle with a higher center of gravity. The correct option highlights the importance of downshifting before setting off. When you downshift to a lower gear before starting to move uphill, it allows the engine to provide more torque, which helps prevent the vehicle from rolling back. This practice uses the engine's resistance to assist in holding the vehicle stationary against the gravitational pull when starting on an incline.

Additionally, downshifting often reduces the need for excessive throttle application, allowing for a smoother acceleration. This technique is particularly useful for heavy vehicles that are more prone to rolling back due to their weight.

Using the accelerator immediately could lead to more significant control challenges and may not provide enough initial torque to prevent rollback. Engaging the handbrake is a helpful practice but doesn't substitute for the technique of downshifting; it simply provides temporary stability while setting off. Lastly, turning the steering wheel away from the curb is a maneuver that promotes safety when parked but isn't relevant in preventing rollback when starting on a hill.