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3. Deterrent Effect The presence of telescopic security posts can act as a significant deterrent to potential intruders. Knowing that access can be controlled and restricted instantly can discourage unauthorized vehicles from attempting to breach secured areas. This psychological factor is crucial in reinforcing an overall security strategy.
As commonly made out of concrete, cast iron, or a combination of concrete and iron, manhole covers are made for the safety of anybody passing above the hole of a sewer. At the same time, standard manhole cover size is being designed to fit in a person size as its second purpose is through it, technically trained individual can pass through it when maintenance is needed on the sewer or during the call of fixing on the underground pipes.