Elevators take people to and from every floor in a high-rise building, but how do you control who gets on the elevators? Tracking only visitors is no longer sufficient. Many security directors are electing to monitor elevator access for all building occupants with optical turnstiles, proximity cards, and video surveillance.
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[source: http://www.buildings.com/ArticleDetails/tabid/3334/ArticleID/11558/Default.aspx]
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