One of the mysteries of the English language finally explained.
An access control system without barriers in which those attempting to enter are evaluated by closed-circuit television or other visual means.
- ‘Being the building's first line of defense, optical turnstiles and door-entry controls are options that more and more buildings are turning to for guarding their entrances.’
- ‘For example, optical turnstiles are now being designed into many high-rise office buildings as well as virtually every government building and high-security facility.’
- ‘One solution that has drawn a good deal of interest is optical turnstiles, which can handle thousands of people in the morning rush effectively and efficiently, says Terry Gillick, vice president of Syska Hennessy Group.’
- ‘Also, optical turnstiles tend to have glass barriers that slide out of an authorized user's path.’
- ‘At the Blue Cross-Blue Shield headquarters, optical turnstiles form the backbone of an access control system.’
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