During the day, which taxiway lighting setting should be used when visibility is less than 1 mile?

• A. One-setting taxiway lights
• B. Two-setting taxiway lights
• C. Three-setting taxiway lights
• D. No taxiway lights

Answer: (A)

Taxiway lighting is adjusted to match visibility and lighting conditions, so the goal is to provide usable guidance without creating glare. When the daytime visibility is less than a mile, the lowest intensity setting—one-setting taxiway lights—offers enough light to outline the taxiway and help pilots follow the route without washing out the scene with brightness. Using higher intensity settings would be unnecessarily bright for daylight and can cause glare or overwhelm pilots’ eyes, while turning lights off would remove critical guidance in limited visibility. The lowest setting gives a practical balance: it preserves guidance along the taxi path in reduced visibility without compromising daylight readability.