Which physical security control consists of a small vestibule with two interlocking doors that each require individual authentication, thereby preventing tailgating or piggybacking into a secure area?
Mantrap
Bollards
Turnstile
Closed-circuit television (CCTV) camera system
A mantrap (security vestibule) encloses a person between two automatically locking doors. The first door must close and typically re-lock before the second door will open, and credentials (badge, PIN, biometrics, guard release, etc.) are usually required for at least one door. Because the system detects or physically restricts multiple occupants, only one authenticated person can transition at a time, effectively stopping tailgating. In contrast, turnstiles slow entry but do not fully enclose the person; bollards protect against vehicle intrusion, and CCTV merely observes activity without physically blocking entrants.
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