Which statement accurately describes the four primary categories of airfield signs?

• A. They are only color-coded and not directional
• B. They include a Hold sign as a separate category
• C. They are not standardized across airfields
• D. They are mandatory instruction signs, location signs, direction signs, and information signs

Answer: (D)

Airfield signs are grouped to convey four clear, essential actions or information, so drivers and pilots can respond quickly and safely. The four categories are: mandatory instruction signs, which require a specific action; location signs, which tell you exactly where you are on the airfield; direction signs, which indicate which way to go or which taxiway to take; and information signs, which provide non-mandatory guidance or details about the airfield. This standard setup is consistent across airfields, so signs are understood the same way everywhere. The Hold sign isn’t its own category; it’s an example of a mandatory instruction sign telling you to stop or hold at a point. Because the statement lists these four categories precisely, it’s the correct description.