The term access control refers to the practice of restricting entrance to a property, a building, or a room to authorized persons. An alternative of access control in the strict sense (physically controlling access itself) is a system of checking authorized presence, see e.g. There may be fences to avoid circumventing this access control. border guard, bouncer, ticket checker), or with a device such as a turnstile. Geographical access control may be enforced by personnel (e.g. Underground entrance to the New York City Subway system
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