What is the purpose of blue lights at an airport?

The blue lights at an airport serve the important function of outlining taxiways. These lights provide clear visual guidance to pilots and ground vehicle operators, especially during night operations or low-visibility conditions. By illuminating the edges of taxiways, blue lights assist in preventing navigational errors and enhance safety as aircraft maneuver on the ground. Knowing the designated taxi routes helps maintain an organized flow of air traffic and reduces the risk of collisions on the airfield.

In contrast, other options such as marking obstructions or indicating hold lines involve different color lights; for instance, red lights are typically used for obstructions and hold positions. Similarly, approach ends of runways are marked using other specific colors to ensure clarity in navigation and safety for approaching aircraft. Hence, blue lights are specifically designated for outlining taxiways, making them an essential part of airport visual guidance systems.