Turnstile A turnstile is a form of gate which allows one person to pass at a time. It can be made so as to enforce one-way movement of people, and in addition, it can restrict passage to people who insert a coin, a ticket, a pass, or similar.

Turnstiles use a mechanism that allows linear or rotary motion in only one direction allowing entry, while preventing motion in the opposite direction.

The turnstiles are usually designed to operate:

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  • After a payment has been made (usually by inserting a coin or token in a slot)
  • By badging a smart card or a proximity card at a proximity reader
  • By inserting a ticket or electronically encoded card.

Turnstiles are often used for counting the numbers of people passing through a gate, even where payment is not involved

Thus a turnstile can be used:

  • To ensure paid access, (for example public transport)
  • As a ticket barrier
  • To restrict access to authorized people, for example in the entrance to a factory or large site

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