What is the purpose of a two-door vestibule (mantrap) in securing sensitive areas?

• A. To verify credentials and prevent tailgating.
• B. To create a larger entry space for crowds.
• C. To serve as a storage area.
• D. To replace the need for surveillance cameras.

Answer: (A)

Two-door vestibule, or mantrap, provides a controlled buffer that enforces one-person-at-a-time entry. The main purpose is to verify credentials and prevent tailgating, because the doors are interlocked and only after successful authentication does the second door allow passage. This setup gives security personnel a moment to confirm identity and reduces the chance that someone can slip in behind another person. It’s not about creating space for crowds or storing items, and it doesn’t replace surveillance cameras—cameras complement the system, while the mantrap’s primary role is to enforce who actually enters by ensuring proper authentication and blocking piggybacking.