what kind of physical access device restricts access to a single individual at any one time

Answer 1

The physical access device that restricts access to a single individual at any one time is typically called a mantrap or a security vestibule. These systems use two interlocking doors where the first door must close before the second one opens, often using weight sensors or cameras to ensure only one person is inside.

Other common devices include:

1. Mantraps (Security Vestibules): A small space with two doors that prevents the second door from opening until the first is closed and the individual is cleared.
2. Turnstiles: Mechanical or optical gates, such as tripod or full-height versions, that rotate to allow only one person to pass per authorization.
3. Security Revolving Doors: Specialized revolving doors equipped with sensors to detect if more than one person is in a compartment, stopping or reversing if tailgating is detected.
4. Optical Sensors: Systems like Door Detectives that use infrared beams to monitor a doorway and sound an alarm if a second person follows an authorized user without swiping.