Planning Assumptions: Safety and Quality EnvironmentsIn planning practice in 2010 there are apparently three key theoretical assumptionsabout safety from crime: permeable street configurations, mixed-use developmentsand high densities.The issue of street permeability has become central to considering how todeliver less crime and more sustainable urban design. There are two distinctperspectives to this topic: the ‘encounter’ model and the ‘enclosure’ model(Dovey, 1998). The ‘enclosure versus encounter’ debate has been raging since the1970s and the theoretical foundations are largely grounded in the observations ofJacobs (1961) and the research and perspectives of Newman (1973) and Hillier(1973), respectively.
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