The street hierarchy is an urban design technique for separating automobile through-traffic from developed areas. It can be seen as a hierarchy of roads that embeds the hierarchy (importance of different roads) in the network topology (the connectivity of the nodes to each other). The street hierarchy completely eliminates all straight-line connections between arterial roads, whereas arterials in a traditional grid plan are connected by dozens of through streets.

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  • The street hierarchy is an urban design technique for separating automobile through-traffic from developed areas. It can be seen as a hierarchy of roads that embeds the hierarchy (importance of different roads) in the network topology (the connectivity of the nodes to each other). The street hierarchy completely eliminates all straight-line connections between arterial roads, whereas arterials in a traditional grid plan are connected by dozens of through streets. Instead, a series of culs-de-sac feed into a primary or secondary "collector"—either a ring road, or a long, curvilinear "front-to-back" path—that in turn feeds the arterial. In the American Midwest, where many grid roads were already laid out, larger subdivisions may have a partial hierarchy, with two to five entrances off one or two main roads limiting through traffic. Since the 1960s, it has been the dominant spatial arrangement of suburbs and exurbs in the United States, Canada, and Australia. It is also increasingly popular in Latin America, Western Europe, and China. Large subdivisions may have three- or even four-tiered hierarchies, feeding into one or two massive collectors, that can be as wide as the Champs-Élysées or Wilshire Boulevard. Arterials at this level are rarely fewer than four lanes in width; and in large contemporary suburbs, such as Naperville, Illinois, or Irvine, California, are often eight or ten lanes wide. Adjacent street hierarchies are rarely connected to one another.
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  • The street hierarchy is an urban design technique for separating automobile through-traffic from developed areas. It can be seen as a hierarchy of roads that embeds the hierarchy (importance of different roads) in the network topology (the connectivity of the nodes to each other). The street hierarchy completely eliminates all straight-line connections between arterial roads, whereas arterials in a traditional grid plan are connected by dozens of through streets.
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  • Street hierarchy
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