Which sign category is used to denote an entrance to a runway or critical area and areas where an aircraft is prohibited from entering?

Which sign category is used to denote an entrance to a runway or critical area and areas where an aircraft is prohibited from entering?

• A. Direction signs
• B. Mandatory signs
• C. Information signs
• D. Runway distance remaining signs

Answer: (B)

Signage on the airfield is grouped by what action the sign requires or the information it conveys. The category that marks entrances to a runway or other critical areas and indicates where entry is prohibited without clearance is the mandatory signs. They have a red background with white characters and tell you exactly what you must do or not do, such as stopping or not crossing a boundary until you have clearance. This is why they are used to designate the boundary to a runway or restricted zones. Directional signs, with yellow backgrounds and black inscriptions, simply guide you where to go. Information signs, also yellow, provide non-mandatory guidance or details. Runway distance remaining signs show how much runway is left and don’t communicate entry restrictions.

Signage on the airfield is grouped by what action the sign requires or the information it conveys. The category that marks entrances to a runway or other critical areas and indicates where entry is prohibited without clearance is the mandatory signs. They have a red background with white characters and tell you exactly what you must do or not do, such as stopping or not crossing a boundary until you have clearance. This is why they are used to designate the boundary to a runway or restricted zones.

Directional signs, with yellow backgrounds and black inscriptions, simply guide you where to go. Information signs, also yellow, provide non-mandatory guidance or details. Runway distance remaining signs show how much runway is left and don’t communicate entry restrictions.