Runway edge lights are essential lighting systems located along the edges of an airport runway. They help pilots see the runway's boundaries during takeoff and landing, especially in low visibility conditions. These lights are typically white, providing clear guidance to aircraft. In addition to runway edge lights, airports may also use runway threshold lights and approach lights to enhance safety. The lights are designed to be visible from a distance, ensuring that pilots can navigate safely and accurately. Proper functioning of these lights is crucial for maintaining safe airport operations.