Boom barrier

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A boom barrier is a bar, or pole pivoted in such a way as to allow the boom to block vehicular access through a controlled point. Typically the tip of a boom gate rises in a vertical arc to a near vertical position. Boom gates are often counterweighted, so the pole is easily tipped. Boomgates are often paired either end to end, or offset appropriately to block traffic in both directions.

Boom Gates are typically found at level (rail) crossings (called Crossing Gates in the United States), checkpoints and entrances to restricted areas. They are also the usual method for controlling passage through Toll booths.

Some boomgates are automatic and powered, others are manually operated. Manual gates are sometimes hung in the manner of a normal gate (i.e. hinged horizonally).

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.