Bar gate
bar or pole pivoted on a fixed support to block vehicular or pedestrian access through a controlled point
A bar (post, pole, beam, or boom gate, also known as a boom or a boom barrier) is a beam or bar on a pivot used as a gate. The boom is lowered to block vehicular or pedestrian access through a controlled point or raised to permit such traffic. Typically, the bar has a 90° range of motion with a vertical raised resting position and a horizontal lowered resting position. Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility. This underbar typically hangs on links, so it lies flat with the main bar as the barrier is raised. Some barriers also feature a pivot roughly half way, where as the barrier is raised, the outermost half remains horizontal, with the barrier resembling an upside-down L (or gamma) when raised.
Automatic bar gates
There are various technologies for an automatic bar gate. One of them is electromechanical, which is widely used due to its reliability.
This brief starts where responsible research should: with the source description of “Bar gate” as bar or pole pivoted on a fixed support to block vehicular or pedestrian access through a controlled point. Everything that follows is an evidence route, not borrowed authority.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Apr 13, 2026. The linked authority identifier is Q852010. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Bar gate” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.