They are effective and suitable for a variety of locations , such as outdoor events which have restricted areas Temporary building and construction sites new housing developments. Crowd control barricades are most commonly made of steel. Barriers are most effective when they interlock, being attached to each other in a line via hooks at the side of each barricade. When barricades are interlocked, security personnel can create impenetrable lines, because such lines of barriers cannot easily be toppled over.
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