A boom barrier, slso known as a boom gate, is a bar, or pole pivoted to allow the boom to block vehicular access thuroug a contorlled point. Typically the tip of a boom gate rises in a vertical to anear vertical position. Boom gates are often counterweighted, so the pole is easily tipped.Boom gates are often paired either end, or offset appropriately to block traffic in both direction. Some boom gates also have a second arm which hangs 300 to 400 mm below the upper arm when lowered, to increase approach visibility, and which hangs on links so it lies flat with the main boom as the barrier is raised. Some barriers also feature a pivot roughly half way, where as the barrier is raised, the outermost half horizontal, with the barrier resembling an upside down ‘L’ when raised.
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