What is the purpose of runway lighting intensity control?

• A. To decrease energy usage.
• B. To indicate runway closure.
• C. To regulate airport noise.
• D. To optimize visibility by adjusting light intensity to ambient conditions.

Answer: (D)

Runway lighting intensity control is about keeping the runway reliably visible by adjusting the brightness of the lights to match current conditions. The system can be automatic or pilot-adjustable, using ambient light, weather, and visibility cues to set the appropriate level. In bright daylight, lowering intensity helps reduce glare and saves energy, while in low light or degraded visibility the lights are brightened to maintain contrast and readability of runway edges, centerline, and touchdown zones. This focused control supports safe takeoffs and landings across a range of conditions. Indicating runway closure or regulating noise aren’t functions of this control; those are handled by other systems and procedures.