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Reference.org
Crowd control barrier
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<p>Crowd control barriers (also referred to as crowd control barricades, with some versions called a French barrier or bike rack in the <a href="/facts/United_States/P0sCdLe5">USA</a>, and mills barriers in Hong Kong) are commonly used at many public events. They are frequently visible at sporting events, parades, political rallies, demonstrations, and outdoor festivals. Event organizers, venue managers, and security personnel use barricades as part of their crowd management planning. </p>