What type of barrier is designed to hold a person in a small area until the door they entered through is secured?

What type of barrier is designed to hold a person in a small area until the door they entered through is secured?

• A. Mantrap
• B. Turnstile
• C. Security gate
• D. Vestibule

Answer: (A)

A barrier that holds a person in a small area until the door they entered through is secured relies on interlocking doors. This arrangement, called a mantrap, creates a tiny chamber between two doors where someone must be verified before the next door will open. The first door closes and locks behind you, and you can’t advance until your credentials are checked and the system authorizes the second door to unlock. This design prevents tailgating and ensures that a person cannot slip into a secure area or bypass verification by following someone else through. Turnstiles restrict one person at a time but don’t require the secure sequencing of two interlocking doors. A vestibule is simply an entry space, not necessarily interlocked with the doors in a way that traps and verifies you. A security gate is a general barrier and may not enforce the same interlocking, controlled sequence.

A barrier that holds a person in a small area until the door they entered through is secured relies on interlocking doors. This arrangement, called a mantrap, creates a tiny chamber between two doors where someone must be verified before the next door will open. The first door closes and locks behind you, and you can’t advance until your credentials are checked and the system authorizes the second door to unlock. This design prevents tailgating and ensures that a person cannot slip into a secure area or bypass verification by following someone else through.

Turnstiles restrict one person at a time but don’t require the secure sequencing of two interlocking doors. A vestibule is simply an entry space, not necessarily interlocked with the doors in a way that traps and verifies you. A security gate is a general barrier and may not enforce the same interlocking, controlled sequence.