Two sets of doors, through which access to the second is not granted until the individual has passed through and closed the first, often referred to as a “man-trap.” A controlled turnstile is also considered an anti-tailgating/piggybacking mechanism.
NOTE: One door is acceptable if it precludes passage by more than one individual at a time, such as a revolving door. the first, often referred to as a “man-trap.” A controlled turnstile is also considered an anti-tailgating/piggybacking mechanism.