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Manually retractable bollards (lowered by a key mechanism) are found useful in some cases because they require less infrastructure. [18] The term "robotic bollards" has been applied to traffic barricades capable of moving themselves into position on a roadway. [19]
Some of the old bollards had “proved unreliable and have been non-operational,” the city said in a statement Wednesday afternoon. ... New York City has put up similar retractable steel columns ...
As vehicle attacks have increased in recent decades, cities around the world have installed bollards in pedestrian-heavy areas. New York City has put up similar retractable steel columns around Times Square, City Hall and Wall Street. They are also a common sight in other large cities such as London, Paris and Tokyo.
She also said there were malfunctions with some of the retractable bollards, the devices which prevent vehicles from accessing streets like Bourbon Street when open to only pedestrians.
Security posts known as bollards were not in place before a suspect drove a truck into a crowd in the French Quarter of New Orleans early on New Year's Day, killing 14 and injuring at least 35.
Retractable or "rising" bollards can be lowered entirely below the road surface (generally using an electric or hydraulic mechanism) to enable traffic to pass, or raised to block traffic. Rising bollards are used to secure sensitive areas from attack, to enforce time-limited traffic regulations, or to allow access only to particular classes of ...
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