What should drivers do if visibility is below certain thresholds on the airfield?

Answer: B — Reduce speed

When visibility is below certain thresholds on the airfield, reducing speed is crucial for several reasons related to safety and operational effectiveness. Lowering the speed allows drivers more time to react to potential hazards, such as other vehicles, personnel, or obstacles that may be difficult to see in low-visibility conditions. Driving at a reduced speed also minimizes the risk of accidents, as it provides better control of the vehicle and allows for more precise navigation, which is especially important in complex airfield environments where runway incursion risks can increase due to poor visibility. In contrast, increasing speed would raise the risk of collisions and reduce the driver’s ability to perceive and respond to hazards. Turning off headlights would further diminish visibility rather than improving it, and using hazard lights may not be the best approach in all scenarios as they can provide a false sense of security and may not adequately communicate the driver's intentions to others on the airfield.