![]() ![]() For instance, a window contact alarm notifies the alarm company if the window is raised. So are chain-link fences topped with razor wire, or patrols cars and armed guards.ĭetect: If deterrence does not work, a criminal may attack the target and the detection layer notifies someone that an attack is occurring. Signs which notify passers-by of security measures are a deterrence. When one starts to design a perimeter protection system you need to consider and evaluate the site, taking cognisance of international best practices, such as the four Ds for perimeter protection systems: Deter, Detect, Delay and Defeat.ĭeter: This prevents crime by convincing the criminal that the target is too tough.
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