{{image url="uploads/bollard/bollards.jpg" class="right" alt="Several examples of different types of bollards" title="Several examples of different types of bollards"}} Usually made of a strong metal pipe or a [[concrete]] post, a bollard is embedded into any bed of [[concrete]] to prevent, or selectively allow, the passage of vehicles into an area. Bollards can also have light fixtures integrated into them. Rising bollards are a fairly recent invention; the bollards can retract into the ground when full passage is required, and extended when security is needed.