What color are the edge lights on aprons and taxiways?

The edge lights on aprons and taxiways are blue. This color designation is critical as it provides pilots and ground vehicle operators with essential information regarding the boundaries of runways and taxiway surfaces. Blue lights are utilized specifically to define the edges of taxiways, helping to ensure that aircraft and vehicles are properly aligned within the designated pathways during both day and night operations. This color is a standard in aeronautical lighting, promoting safety by clearly indicating where it is safe to maneuver on the airside.

In contrast, other colors serve different purposes: red lights typically indicate a stop condition or a no-entry area, green lights are used on runway centerlines, and yellow lights usually indicate taxiway centerlines or caution areas. Understanding the meaning of different colors in airside operations is crucial for maintaining safety and efficiency on the grounds of an airport.