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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.
As physical obstacles, we can enumerate all those physical barriers that block the action and prevent the progress or the achievement of a concrete goal. Examples: architectural barriers that hinder access to people with reduced mobility; doors, gates, and access control systems, designed to keep intruders or attackers out;
An example of this is the deployment of security personnel conducting checks for authorized entry at predetermined points of entry. This form of access control is usually supplemented by the earlier forms of access control (i.e. mechanical and electronic access control), or simple devices such as physical passes.
The mountains, rivers, oceans, deserts, canyons, and glaciers of the world have long provided a natural barrier to invasion and trade among competing groups. A prime example is India's isolation from the rest of Asia due to the Himalayas. [6] The English Channel proved invaluable in World War II as a deterrent to Nazi aggression. [7]
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 .
A safety barrier is a component which prevents passage into a dangerous area, and is commonly used to mitigate risk. Description A safety barrier is a component which ...
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Traffic barrier with a pedestrian guardrail behind it. Traffic barriers (known in North America as guardrails or guard rails, [1] in Britain as crash barriers, [2] and in auto racing as Armco barriers [3]) keep vehicles within their roadway and prevent them from colliding with dangerous obstacles such as boulders, sign supports, trees, bridge abutments, buildings, walls, and large storm drains ...