What color indicates an active runway light system?

• A. Red lights
• B. Green lights
• C. White lights
• D. Amber lights

Answer: (C)

The active runway light system is indicated by green lights. This color is universally recognized in aviation as signaling the runway's centerline and is crucial for pilots during approach and landing. Green lights aid in visually guiding aircraft safely along the runway, particularly during low visibility conditions or nighttime operations.

In contrast, red lights typically signify caution or danger, often used to indicate the presence of hazards or to mark the edges of runways. White lights are also present in runway lighting systems but primarily serve different purposes, such as illuminating the runway itself. Amber lights are generally used to indicate caution areas or to signify that a runway is closed or to alert pilots of upcoming changes. Each color serves a distinct role in the aviation lighting system, with green specifically marking active runways.