No Entry Signs are an example of which category?

• A. Mandatory Instruction Signs
• B. Direction Sign Array
• C. Obstacle Free Zone/APCH signs
• D. Runway Exit Signs

Answer: (A)

No Entry Signs are designed to convey a command that must be followed—prohibiting entry into a restricted area or beyond a boundary until clearance is given. That fits the category of mandatory instruction signs, which are red with white markings and indicate actions or prohibitions you must observe. They differ from direction signs, which guide where to go (arrows and destinations), and from information or guidance signs that provide non-mandatory information. They also aren’t specific runway exit decals, which indicate where to leave a runway. So, a No Entry Sign is a mandatory instruction sign because it directly commands compliance by prohibiting access.