Simply placing crowd control barricades next to each other can act as a visual and psychological message of a “no access” zone, but it cannot truly secure that zone in the event of a crowd surge. Whether a site has to protect A-List Hollywood celebrities, spectators at a parade, or public officials at rallies or speeches, barricades must be set up in interlocked lines to ensure proper crowd control and prevent incidents such as the one which nearly injured Julia Roberts and her fans at the SAG Awards.
As the animation below demonstrates, the hooking system locks the barriers in place and reinforces the entire line of barricades.