What are flashing anti-collision lights primarily used for?

Flashing anti-collision lights are primarily used to enhance the visibility of an aircraft, particularly to make it more noticeable to other pilots and ground personnel. These lights serve an essential safety function by reducing the risk of collisions. When an aircraft is on the ground or in the air, the flashing lights draw attention to it, making it easier for other airplanes, as well as vehicles on the ramp or runway, to see its position and movements. This heightened visibility is crucial during times of limited visibility, such as at dusk, dawn, or during inclement weather, thereby contributing to overall flight safety.

While other options might describe certain aspects of flight operations, they do not accurately represent the primary purpose of flashing anti-collision lights. Indicating approach for landing, signaling for help, and announcing takeoff pertain to different signaling methods and protocols used during specific phases of flight rather than the core function of enhancing an aircraft's visibility through flashing lights.