CPTED is an approach that focuses on the positive use of a space and natural elements in order to maintain a sustainable quality of life for intended users, while offering a sense of security by increasing the difficulty for criminal or abnormal activities. The principles of CPTED: natural access control, natural surveillance, and territoriality when integrated with the principles of physical security, present a unique approach to Critical Infrastructure Protection. The environmental components identified with CPTED may also offer opportunities to address sustainable design objectives.
Natural Access Control
 Natural Access Control opportunities exist when environmental site features and structures can be utilized to restrict access to areas to address an identified hazard or threat. These features include ravines, walls, stormwater facilities, dense plantings, etc., which create a variety of horizontal and vertical obstacles and barriers.
Natural Surveillance
 Natural Surveillance opportunities exist when spaces can be defined such that sufficient lines of sight exist to monitor activities in critical areas for operational and/or security reasons. This is achieved through placement of windows, layout of circulation and access points, along with strategic siting of physical security measures, i.e., security posts, surveillance cameras, etc.
Territoriality
 Territoriality opportunities exist when specific areas can be physically or psychologically segregated such that potential intruders recognize the area as a controlled space. Various site features can be incorporated into territoriality, including signage, lighting, walls, planters, pavement patterns, etc.
CPTED Links: http://www.cptedtraining.net/ http://www.cpted-watch.com/ http://www.cpted.net/home.html
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