T-Zones refer to the Rural to Urban Transect

Wikipedia’s definition:  The urban-to-rural transect is an urban planning model created by New Urbanist Andrés Dauny. The transect defines a series of zones that transition from sparse rural farmhouses to the dense urban core. …The transect is an important part of the New Urbanism and smart growth movements. … The importance of transect planning is particularly seen as a contrast to modern Euclidean zoning and suburban development. In these patterns, large areas are dedicated to a single purpose, such as housing, offices, shopping, and they can only be accessed via major roads. The transect, by contrast, decreases the necessity for long-distance travel by any means.. The Transect has six zones, moving from rural to urban. … A major feature of transect planning is that it incorporates a variety of residential and commercial spaces into a single neighborhood (mix-use). A typical neighborhood would consist of a light commercial area with a bank, general store, pub, coffee shop, and apartments. Moving outwards from the center, residential density would gradually decrease starting with apartments to townhouses to fully detached houses. The central area would be a focus of transit and ideally be within walking distance from any point in the neighborhood.

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