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Perimeters

Gates and access control

Fences and walls will protect your site by:

deterring and delaying intruders
marking a boundary
protecting guards from surprise attack
enabling the use of guard dogs
acting as a barrier to vehicles
enabling the use of Perimeter Intruder Detection Systems
protecting against explosive attack

Walls have the following additional uses:

to protect against rockets, small arms, blast and fragments
to prevent observation of guard and patrol movements and of other protective measures.
creating a "stand-off" for any explosive device

Fences and walls provide only limited delay against intruders; the least secure types can only delay a skilled intruder for a few seconds. A perimeter barrier intended to impede intruders should therefore combine a fence or wall with security lighting and human or electronic surveillance, eg a Perimeter Intruder Detection System (PIDS) and Closed Circuit Television (CCTV). Expert advice must be sought and the perimeter barrier planned as a whole.

Toppings are designed to increase the difficulty of climbing a fence or wall by increasing the overall height of the fence and also snagging and/or cutting the intruder. It should not be allowed to aid an intruder by providing a firm hand or foothold. There are many different types of topping available including barbed wire and spikes.

Gates and access control

Vehicle access control points (VACP) include the roadway, gatehouse, guard booth, traffic control devices, search areas and barriers, whether temporary or permanent.

The approach area should:

reduce the speed of approaching vehicles
ensure that a hostile vehicle cannot avoid the VACP and enter the secure side of the installation perimeter. Features such as ditches and high kerbs could be used.
have the capability to separate traffic by types (eg staff, deliveries and site visitors)
provide enough assembly area for queuing vehicles and pedestrians and enable VIP priority access
provide the first opportunity to identify any threat.