Bollards come in many shapes, colors, sizes and material. Common types of bollards include those made of steel and concrete (used to provide security), aluminum and cast iron (used in landscaping), and rubber and recycled material (used when flexibility is required).
Bollards have three basic functional categories: landscaping, architectural and security. In landscaping, bollards provide perimeter highlights, while architectural bollards are used for decorative value. Crash-resistant bollards provide protection from impact and are commonly used at government buildings, airports, prisons and United States embassies.
Some bollards come with additional features, including speakers, lighting or auxiliary power generators. Others can be removed from the ground to permit limited access. Retractable bollards are also available and can be operated manually, electronically or hydraulically.
