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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.
Perhaps the most famous illustration of perimeter security in ancient times was the Great Wall of China. It was originally built to withstand nomadic invaders from the North. The wall was successful to some degree, although it has been suggested that it served as more of a psychological barrier than a physical barrier. [2]
2.1 Physical barriers. 2.1.1 European certifications. 2.2 Surveillance. 3 ... The term window security may refer to any of a range of measures used to avoid ...
The barrier is not a continuous structure but a series of obstructions variously classified as "fences" or "walls". [2] Between the physical barriers, security is provided by a "virtual fence" of sensors, cameras, and other surveillance equipment used to dispatch United States Border Patrol agents to suspected migrant crossings. [3]
Standoff distance may be ensured using fixed physical barriers such as fences or bollards; temporary placement of items to block access (e.g., using law enforcement vehicles or police tape to block a road or bridge); physical features other than barriers (these may appear innocuous, such as the White House lawn or adding an ornamental pond ...
The president also ordered the construction of additional physical barriers. In an order, Trump wrote: “The Secretary of Defense, or the Secretary of each relevant military department, as ...
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