Bollards are short vertical posts used to protect exposed structures or objects from damage by moving vehicles. These can be any visual and design variety of structures used to control or direct road traffic, such as posts arranged in a line to obstruct the passage of motor vehicles or barriers put in place to protect areas where safety counts. A good example is reinforced concrete planters that protecxt gas pumps from damage. Sizes can range from 24” to 42” in height with different diameters depending on the degree of security required. They are a specialty product that targets a specific task or threat. Bollards are available  as collapsible, removable, manually assisted and automatic pop up types.