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Vehicle barrier at the US Mexico border, 2010 Physical barriers such as security fences, walls, and vehicle barriers act as the outermost layer of security. They serve to prevent, or at least delay, attacks, and also act as a psychological deterrent by defining the perimeter of the facility and making intrusions seem more difficult.
A natural barrier is a physical feature that protects or hinders travel through or over. Mountains , swamps , deserts and ice fields are among the clearest examples of natural barriers.
An obstacle (also called a barrier, impediment, or stumbling block) is an object, thing, action or situation that causes an obstruction. [1] A obstacle blocks or hinders our way forward. Different types of obstacles include physical, economic , biopsychosocial , cultural, political, technological and military.
A border barrier, border fence or border wall is a separation barrier that runs along or near an international border. Such barriers are typically constructed for border control purposes such as curbing illegal immigration , human trafficking , and smuggling .
For general applications, a berm is a physical, stationary barrier of some kind. For example, in highway construction, a berm is a noise barrier constructed of earth, often landscaped, running along a highway to protect adjacent land users from noise pollution. The shoulder of a road is also called a berm and in New Zealand the word describes a ...
A separation barrier or separation wall is a barrier, wall or fence, constructed to limit the movement of people across a certain line or border, or to separate peoples or cultures. [1] A separation barrier that runs along an internationally recognized border is known as a border barrier .
A notch weir is any weir where the physical barrier is significantly higher than the water level except for a specific notch (often V-shaped) cut into the panel. At times of normal flow all the water must pass through the notch, simplifying flow volume calculations, and at times of flood the water level can rise and submerge the weir without ...
A safety barrier is a component which prevents passage into a dangerous area. It is commonly used to mitigate risk in the Hazard-Barrier-Target model, as studied in safety science. Work Safe Victoria (an Australian organization) defines a Safety Barrier as a device that: [1] physically separate the work area and the traveled way,