Which of the following factors does NOT decrease a danger zone?

The correct answer indicates that heavy loads do not decrease a danger zone. Instead, heavy loads can actually increase the danger zone because they affect the vehicle's handling, braking distance, and overall stability. When a heavy load is involved, the driver must account for the increased weight and its impact on stopping power and maneuverability, which can lead to a larger danger zone when operating the vehicle.

The other factors mentioned, such as covering the brake, lower speeds, and smaller vehicles, contribute to a decrease in the danger zone. Covering the brake allows the driver to respond more quickly in an emergency, thus reducing the likelihood of an accident. Lower speeds generally allow for better control and shorter stopping distances, which also help minimize the danger zone. Smaller vehicles typically have better maneuverability and may be less intimidating to operate, which can further reduce the danger zone in certain driving situations.