A bar or pole pivotal to allowing the boom to restrict automotive or pedestrian access through a regulated location is called a boom barrier, sometimes called a boom gate. Normally, the point of a boom gate rises vertically in an arc to an almost vertical position. Boom gates are frequently counterweighted, making it simple to tip the pole. Boom gates are frequently used in pairs or with the proper offset to restrict traffic in both directions.
Some boom gates additionally feature a second arm that, when lowered to improve approach visibility, hangs 300–400 millimeters below the upper arm. This arm hangs on links so that when the barrier is lifted, it lies flat with the main boom. Some barriers have a pivot around halfway up so that as the barrier is lifted, the outermost portion stays horizontal, giving the barrier the appearance of an upside-down L.
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