Bommene

Bommene is Norwegian for "the barriers," referring to physical barriers used to block or permit passage. In transport and access-control contexts, a bom is typically a long rigid arm attached to a hinge or pivot, forming a boom barrier. The arm, usually made of steel or aluminum, is mounted on a post or gate structure. When closed, the arm spans the passage to prevent entry; when open, it is raised or rotated to allow passage.

Locations for bommenes include toll booths, railway level crossings, parking facilities, and restricted street or facility access points. They can be operated automatically by sensors and control systems that respond to traffic signals, ticketing, or train movements, or manually by an operator using a switch or key. Modern systems often pair a visible signal with an audible warning to alert approaching users before contact with the arm.

Types of bommenes vary: fixed-location barrier systems may use one or more arms across an opening; some barriers are retractable or employ vertical-lift designs. Beyond road use, booms are also employed in ports, warehouses, and border controls, where access control is essential for safety or security.

Safety and maintenance: bommenes are designed to minimize injury or damage and should comply with local safety standards. Regular inspection, lubrication, alignment checks, and sensor testing are routine. Equipment such as safety edges, photoelectric sensors, and interlocks help reduce the risk of entrapment and ensure reliable operation.