Air Traffic Skills Assessment (ATSA) PracticeTest

Taxiway edges are illuminated by blue omnidirectional lights, which serve a critical function in helping pilots navigate safely during night operations. These blue lights are specifically designed to mark the edges of taxiways, providing clear visual cues that help pilots maintain the correct path and avoid confusion with runways or other aircraft movements. The use of blue lights is standardized across airports to ensure consistency and safety for all aircraft operators. This makes it easier for pilots to distinguish between different areas of the airfield, especially in low visibility conditions. By guiding pilots along the taxiways, these lights enhance situational awareness and prevent incursions onto active runways. In contrast, while red lights are used to indicate the edges of runways or to signify errors and caution, white lights are typically employed for runway centerlines and aircraft landing/takeoff guidance. Flashing yellow lights may be used in certain areas for additional warnings or indications, but they are not dedicated edge markers for taxiways. Thus, the identification of taxiway edges is uniquely attributed to blue omnidirectional lights, making them the correct choice in this context.