Plain English Meaning

The lights on the ground that show pilots where the taxiways are and how to follow them when it's dark or hard to see. Blue lights mark the edges; green lights, when present, mark the middle.

Full Definition

Airport lights that outline taxiways and guide aircraft along the surface between runways, ramps, and parking areas during night operations or low visibility. The standard system uses omnidirectional blue edge lights to mark the sides of the taxiway, and may include green centerline lights, clearance bar lights, and lighted signs at intersections and positions.