Boom barrier

A boom barrier, also known as a boom gate,[1] is a bar, or pole pivoted to allow the boom to block vehicular or pedestrian access through a controlled point.[2] Typically, the tip of a boom gate rises in a vertical arc to a near vertical position. Boom gates, especially manually operated ones, are often counterweighted,[3] so the pole is easily tipped. Boom gates are often paired either end to end, or offset appropriately to block traffic in both directions. 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 remains horizontal, with the barrier resembling an upside-down L (or gamma Γ) when raised.

This article is about barriers for land vehicles. For chains or other barriers to block rivers or harbours, see boom (navigational barrier).
Not to be confused with a crossbuck, which often accompanies a boom barrier.
Animation of level crossing boom barriers lowering in Queensland, Australia.
Boom barriers in the Netherlands.

Automatic boom barrier

There are various technologies for an automatic boom barrier. One of them is electro-mechanical, which is widely used due to its reliability. The other technologies are often manufacturer specific. These electro-mechanical devices come with 24-volt direct-current drive units which can run continuously without generating heat, so electro-mechanical boom barriers can be operated continuously and in an intensive duty cycle.

An automatic boom barrier can be operated through:

Usage
Entrance of the parking garage with boom barriers in Münster, Germany

Boom gates are typically found at level crossings,[7] drawbridges, parking facilities, checkpoints and entrances to restricted areas. They are also the usual method for controlling passage through toll booths,[8] and can also be found on some freeway entrance ramps which are automatically controlled to drop to restrict traffic in the event of accident cleanup or road closures without the need to dispatch road workers or law enforcement to use a vehicle to block the way. Some boom gates are automatic and powered; others are manually operated. Manual gates are sometimes hung in the manner of a normal gate (i.e. hinged horizontally). In some places, boom gates are installed across suburban streets as a traffic calming measure, preventing through traffic, while allowing authorised vehicles such as emergency services and buses to take advantage of the shorter and more direct route.

See also
Wikimedia Commons has media related to Boom barriers and Level crossing barriers.

References
  1. Sinaga, Rijoi; Sihombing, Filbert; Muttaqin, Maraghi. Automatic Parking Portal Mechanical System Design with DC Motor Development. p. 255. Retrieved 26 October 2023.
  2. Chaudhuri, Monalisa (2018-07-02). "Boom barrier to jaywalking". Retrieved 2019-03-17.
  3. Sen, Ar Prof Indranil. Theory of Architecture: Concept to Commissioning. Notion Press. ISBN 978-93-5206-696-4. Retrieved 26 October 2023.
  4. Ranjini, R; Manivannan, D. "A Comparative Review on Car Parking Technologies". International Journal of Engineering and Technology (IJET). 5 (2): 1766. Retrieved 26 October 2023.
  5. Chaulya, Swadesh; Prasad, G. M. (10 June 2016). Sensing and Monitoring Technologies for Mines and Hazardous Areas: Monitoring and Prediction Technologies. Elsevier. p. 114. ISBN 978-0-12-803195-7. Retrieved 26 October 2023.
  6. Bhatia, Madhulika; Bhatia, Surabhi; Poonam, Tanwar; Kuljeet, Kaur (1 May 2023). Applying AI-Based IoT Systems to Simulation-Based Information Retrieval. IGI Global. p. 108. ISBN 978-1-6684-5256-1. Retrieved 26 October 2023.
  7. Taylor, Michael A. P. (29 September 2020). Climate Change Adaptation for Transportation Systems. Elsevier. p. 244. ISBN 978-0-12-816647-5. Retrieved 26 October 2023.
  8. Innovative Business Strategies. Archers & Elevators Publishing House. p. 180. ISBN 978-93-83241-95-8. Retrieved 26 October 2023.
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