Crowd control barriers, which is also called as crowd control barricades, French style barrier, metal bike rack, and mills barriers, are commonly used at many public events.
The crowd control barriers are made of heavy duty hot dip galvanized steel. Crowd control barriers are most effective when they interlock, being attached to each other in a line via hooks at the side of each barricade. When crowd control barricades are interlocked, security personnel can create impenetrable lines, because such lines of barriers cannot easily be toppled over.