Which sign category includes No Entry Signs among its examples?

Which sign category includes No Entry Signs among its examples?

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

Answer: (A)

No Entry signs are a clear example of instructions you must follow to protect safety, which is what Mandatory Instruction Signs convey. In the ICAO signage system, these signs are red with white lettering and indicate actions that are mandatory or restricted to entry into a certain area. A No Entry sign tells you that you must not proceed beyond that point, so it fits squarely in the mandatory instruction category. The other signs serve different purposes: Runway designation signs identify which runway you’re near or on, helping you confirm location; Direction Sign Arrays provide taxi routing guidance; Obstacle Free Zone signs mark safety boundaries around runways and do not impose the explicit prohibition that a No Entry sign does.

No Entry signs are a clear example of instructions you must follow to protect safety, which is what Mandatory Instruction Signs convey. In the ICAO signage system, these signs are red with white lettering and indicate actions that are mandatory or restricted to entry into a certain area. A No Entry sign tells you that you must not proceed beyond that point, so it fits squarely in the mandatory instruction category.

The other signs serve different purposes: Runway designation signs identify which runway you’re near or on, helping you confirm location; Direction Sign Arrays provide taxi routing guidance; Obstacle Free Zone signs mark safety boundaries around runways and do not impose the explicit prohibition that a No Entry sign does.