Barricades are physical barriers used to block or control access to an area. They can be made from various materials, such as wood, metal, or plastic, and are often employed in situations like protests, construction sites, or during emergencies. Barricades help ensure safety by preventing unauthorized entry and directing the flow of people or vehicles. In addition to their use in crowd control, barricades can also serve as protective measures in military operations. They are often used to fortify positions and provide cover for soldiers. Examples of barricades include traffic cones, fences, and sandbags.