What safety feature must be activated while driving on an airfield?

The safety feature that must be activated while driving on an airfield is a beacon. Beacons are essential for ensuring visibility and alertness within the airfield environment, which is filled with various hazards and moving vehicles. When a beacon is activated, it emits a bright, flashing light that serves to warn others of the vehicle's presence, thereby enhancing safety for both vehicle operators and personnel in the vicinity. This is particularly critical on an airfield where operations involve aircraft, ground handling equipment, and other vehicles that could be in close proximity to one another.

In contrast, while backup cameras, headlights, and windshield wipers may serve useful purposes during vehicle operation, they do not specifically fulfill the airfield safety requirement in the same way that beacons do. Headlights mainly provide illumination for low-light conditions but are not as effective in alerting others of the vehicle’s presence. Backup cameras assist in reversing and avoiding obstacles but do not contribute to overall visibility within the airfield. Windshield wipers are important for maintaining visibility in inclement weather but are not directly related to alerting others in the airfield context.