Bollards are commonly used for security barriers

I didn't really know what those yellow posts are called that I often see blocking restricted areas especially during construction. Well, now I know, because I found a website that has them available for purchase to supply those who may need some to prevent vehicles from accessing areas that are under construction or simply restricted. They are commonly used to secure an area where crimes have occurred, too. Yes, these manually operated removable and collapsible vehicle access control bollards are sure to protect areas that are restricted and what people rely upon with preventing vehicle access to restricted areas. They are being manufactured by a company that specializes in making them top-of-the-line, durable, and quality as what security barriers and traffic control devices should be.