Which signs have a red background with white numbers or letters and denote entrance to a runway, a critical area, or a prohibited area?

Which signs have a red background with white numbers or letters and denote entrance to a runway, a critical area, or a prohibited area?

• A. Mandatory Signs
• B. Location Signs
• C. Information Signs
• D. Direction Signs

Answer: (A)

Red-background signs with white letters are mandatory signs. They convey actions you must follow and mark boundaries where entry is controlled, such as the entrance to a runway, a critical area, or a prohibited area. This makes them the best fit for signaling that specific restrictions apply and that pilots or personnel must comply before proceeding. Other sign types use different color schemes and purposes—location signs are black with yellow lettering to indicate where you are on the movement area, information signs are yellow with black lettering to provide guidance, and direction signs are also yellow with black lettering to show where to go. None of these indicate a required action or boundary in red with white characters.

Red-background signs with white letters are mandatory signs. They convey actions you must follow and mark boundaries where entry is controlled, such as the entrance to a runway, a critical area, or a prohibited area. This makes them the best fit for signaling that specific restrictions apply and that pilots or personnel must comply before proceeding.

Other sign types use different color schemes and purposes—location signs are black with yellow lettering to indicate where you are on the movement area, information signs are yellow with black lettering to provide guidance, and direction signs are also yellow with black lettering to show where to go. None of these indicate a required action or boundary in red with white characters.