A movable barrier is an object that can be moved to block or restrict access to a certain area. The two most common types of movable barriers are hurdles and gates. A HURDLE is a barrier made of a frame of thin vertical posts, usually made of wood or metal, and is typically used in sports such as horse racing and track and field. A GATE is a barrier that is usually made of metal or wood and is used to control access to a certain area.