This document discusses various types of security barriers and access control systems, including boom barriers, drop arm barriers, turnstiles, flap barriers, sliding gates, road blockers, rising bollards, and crash resistance barriers. It explains that automatic barriers can efficiently regulate traffic at entry and exit points of buildings to manage security. Different barrier types are suited for different applications depending on the space and expected traffic. The document also provides details on specific barrier models like drop arm turnstiles and tripod turnstiles, and concludes with contact information.