Which vehicle condition requires a greater stopping distance?

The correct choice indicates that loaded trucks require a greater stopping distance. This is primarily due to the increased weight that a loaded truck carries. The heavier the vehicle, the more momentum it has while in motion, making it significantly more difficult to stop quickly. When a loaded truck comes to a halt, the greater mass means that it takes longer for the brakes to overcome the momentum and bring the vehicle to a complete stop.

In contrast, when trucks are empty, they generally have a lighter weight and can stop relatively faster. This is because there is less inertia to overcome.

Additionally, trucks with a trailer also require specific braking considerations as the combined weight can affect stopping distances, but a loaded truck remains the primary factor in discussing increased stopping distance.

Trucks in poor condition could certainly compromise braking efficiency and require greater stopping distances; however, the inherent weight factor of a loaded truck is a more direct and applicable reason for the increased stopping distance in normal driving conditions.