The Runway boundary sign is designed to protect which area?

• A. Runway
• B. Taxiway
• C. Apron
• D. Approach area

Answer: (A)

Runway boundary signs define the edge of the runway’s protected/movement area. They alert pilots and ground personnel where the runway environment ends, helping prevent inadvertent entry into the active runway and ensuring clearance is obtained before crossing or entering that area. This sign is specifically about the boundary of the runway itself, not other zones. Taxiways, aprons, and approach areas are marked and controlled by other signs and cues, so they aren’t described by the runway boundary sign.