Posted Mar 20, 2018, 11:40 PM
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Registered User
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Join Date: Dec 2016
Location: San Francisco
Posts: 24,177
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Quote:
Housing, Inclusion, and Public Safety
Crime is related in part to the built environment. The planning subfield of crime prevention through environmental design has developed a substantial amount of research on ways in which design elements such as lighting and opportunities for surveillance can reduce crime . . . .
The relationship between environmental design and crime suggests that the environment can be designed or altered in ways that reduce crime. One planning subfield, crime prevention through environmental design (CPTED), has developed a substantial amount of research on the relationship between environmental design and public safety. Increasing the level of surveillance over an area, controlling access, and establishing clear territorial boundaries with fences or landscaping can help reduce crime. For instance, by incorporating lighting and surveillance, limiting possible escape routes, and promoting high visibility in public and semipublic spaces, potential criminals have fewer opportunities to conceal activities or evade law enforcement. Increasingly, CPTED also considers the relationship between the built environment and social factors that influence crime, such as how a space can be designed to host festivals and cultural events that foster a strong sense of place and community. CPTED is complex and difficult to evaluate, raising research quality questions and precluding definitive conclusions regarding its effectiveness, but several studies find reduced crime and other positive outcomes in places that have implemented CPTED interventions . . . .
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https://www.huduser.gov/portal/perio...ighlight1.html
Quote:
CPTED principles can be translated into various planning and design strategies that would enhance security. These strategies can be categorised as follows:
1. allow for clear sight lines,
2. provide adequate lighting,
3. minimise concealed and isolated routes,
4. avoid entrapment,
5. reduce isolation,
6. promote land use mix,
7. use of activity generators,
8. create a sense of ownership through maintenance and management,
9. provide signs and information and
10. improve overall design of the built environment . . . .
PROBLEMATIC SPACES
Visibility should especially be taken into account when designing or planning spaces where risk to personal safety is perceived to be high, such as stairwells in multi-storey car parks, underpasses and lobby entrances to high-rise buildings.
CONCEALED OR ISOLATED ROUTES
• Can concealed and isolated routes such as staircases, passageways or tunnels be eliminated?
• Are there entrapment areas within 50 - 100 metres at the end of a concealed or isolated route?
• Is there an alternate route?
• If a pedestrian cannot see the end of a concealed or isolated route, can visibility be enhanced by lighting or improving natural surveillance?
• Are concealed or isolated routes uniformly lit?
• Is there natural surveillance by people or activities through various land uses?
• Is there formal surveillance?
• Is access to help e.g. security alarm, emergency telephones, signage and information available?
ENTRAPMENT AREAS
• Is there an entrapment area and can it be eliminated?
• Can it be closed during off hours?
• Is the entrapment area visible through natural or formal surveillance?
• Does design provide for escape routes?
Crime Prevention Through Environmental Design Guidebook 31
APPENDIX A: CHECKLIST
ISOLATION
• Does design incorporate natural surveillance?
• Do areas of concerns such as isolated routes and parking areas provide natural surveillance?
• If providing natural surveillance is not possible, are emergency telephones, panic alarm and attendants provided?
• Can compatible land uses be provided to increase activity?
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http://www.popcenter.org/tools/cpted/PDFs/NCPC.pdf
None of these design features preclude high rises but on a practical level, cities like San Francisco have found it easier to incorporate them in lower-rise structure that don't need elevators, interior hallways, lobbies and so on. Especially where there is sufficient land available between existing high rises to house the same number of people in lower rise structures without such features by covering a substantially higher percentage of the site with buildings, that has been found to be a way to accomplish the suggested design goals.
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