Used crowd control barriers for sale;ccb also called Crowd control barriers referred to as crowd control barricades. Some versions, called a french barrier or bike rack in the USA, are commonly used at many public events. Crowd control barriers have been designed for use at events that need to accommodate a larger crowd. They are designed to discourage transgression and physically encourage directional order and crowd control. Their flat feet feature (to prevent trip hazards) provides a quick and efficient solution in any situation where you need to divert patrons and the general public away from a designated area.