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A bell bollard is a style of bollard designed to deflect vehicle tires. The wheel mounts the lower part of the bollard and is deflected by its increasing slope. Such bollards are effective against heavy goods vehicles that may damage or destroy conventional bollards or other types of street furniture.
Hard barriers are fixed into the ground as a bollard or gate, removable on stands, or clipped to a structure. Regardless of the barrier type, the components and overall assembly will be similar. Regardless of the barrier type, the components and overall assembly will be similar.
Some forms of motorsport use removable, high-visibility bollards on road courses and street courses to mark the apex of certain corners. They are used to deter cutting a corner too tightly and violating track limits: in most racing series, drivers may incur a penalty for colliding with or driving inside these bollards.
A removable guardrail as median barrier In traffic engineering, a highway guardrail may prevent an errant vehicle from hitting roadside obstacles, which may be either man-made (sign structures, culvert inlets, utility poles) or natural (trees, rock croppings), running off the road and going down a steep embankment, or veering off the roadway ...
Also called "bollards". Bilge: the lowest part of the interior of a hull. Water, fuel tanks, ballast, and heavy stores are variously placed in the bilge to lower the craft's centre of gravity. Bilge keels: a pair of short keels fitted on either side of the hull. Less hydro-dynamically efficient than a fin keel, they have a shallower draft.
In the late 19th century the first cast iron bollards were made. From 1915 onwards there was a standard bollard of cast iron, weighing 70 kg (154 lb), with three Saint Andrew's Crosses from the coat of arms of Amsterdam. This bollard already looked like the modern Amsterdammertje, although, amongst other differences, it was thinner and heavier. [2]
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