Which color marks restricted areas?

• A. Blue.
• B. Red.
• C. White.
• D. Yellow.

Answer: (B)

Access control on the airfield is conveyed through color-coded markings, and red is used to indicate restricted areas. That means any boundary, sign, or marker in red signals that entry is not allowed for unauthorized personnel and typically requires proper clearance or an escort. This helps protect sensitive zones around terminals, fueling areas, and aircraft operations, and it guides firefighters and other responders to respect these limits during routine work or emergencies.

The other colors serve different purposes: blue, white, and yellow are used for other safety cues, guidance, or information on the airfield and do not signify restricted access in the same direct way.