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Outer Defense (Barriers (Comprise the topographical features that assist…

- - - - The lock used should be distinctive and immediately identifiable.
    - - Personnel gates are usually from 4 to 7 feet wide to permit single- line entry or exit.
        
        It is important that they not be so wide that control of personnel is lost.
    - - Virtually every facility has a number of miscellaneous oppenings that penetrate the perimeter.
        
        They must be taken into account because they are often the most effective ways to enter the facility without being observed
        
        These openings or barrier breaches consist of
        
        Sewers
        
        Culverts
        
        Utility tunnels
        
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- - - - is a type of steel fencing wire constructed with sharp edges or points arranged at intervals along the strand.
        
        Is used atop walls surrounding secured property.
    - - Is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina
        
        With the exception of concertina wire, most fencingg is largely a psychological deterrent and a boundary marker
        
        More than a barrier because in most cases such fences can be easily penetrated unless additional safety measures are taken to improve the safety of the fence
    - - Is a type of woven fence usually made from galvanized or LLDPE-coated steel wire
        
        The wires run vertically
        
        and are bent into a zig-zag pattern so that each "zig" hooks with the wire immediately on one side and each "zag" with the wire immediately on the other.