When must a driver use headlights on the airfield?

Answer: B — During periods of low visibility

Using headlights during periods of low visibility is essential for several reasons. Low visibility can arise from conditions like fog, heavy rain, or other weather factors that can hinder a driver's ability to see and be seen. By activating headlights in such situations, a driver increases their visibility to other vehicles and personnel on the airfield while also improving their own visibility of surroundings. This is crucial for maintaining safety and preventing accidents in a busy airfield environment where awareness of one's surroundings is vital. The practice ensures that all drivers are easily identifiable, reducing the risk of collisions with aircraft, ground service vehicles, and other personnel. It's part of the standard protocol for maintaining safety within the airfield, aligning with the overall safety regulations set forth for operating vehicles in such environments.