Why is it important to use 4-way flashers when backing?

Using 4-way flashers when backing is crucial because it serves to alert other drivers about your actions. When a vehicle is in reverse, particularly in a location where visibility may be limited, other drivers may not expect a vehicle to be moving backward. Activating the 4-way flashers signals your presence and intention to reverse, providing a visual cue that enhances safety for both you and those around you. This is important for avoiding potential accidents and for ensuring that other road users take precautionary measures while approaching your vehicle.

The other options, while they may involve different situations, do not capture the primary safety function of the 4-way flashers in this context. Indicating confusion or engine concerns does not relate to the immediate communication of your reversing action to others on the road.