A tank-trap is a defensive obstacle that is used to obstruct the movement of enemy vehicles, especially tanks. Synonyms for tank-trap include anti-tank obstacle, roadblock, barricade, barrier, hurdle, blockage, check-point, and obstacle course. These words are often used to describe structures that are designed to slow down or deter enemy movements. Some of the most common types of tank-traps are concrete blocks, concrete walls, steel barriers, and concertina wire. These barriers are often used in high-security areas such as military bases, government buildings, and important infrastructure sites. By using tank-traps, organizations can increase their security and protect against potential attacks.