"Rather than all traffic being permitted on all (nine) streets between and among those blocks, cordon off a perimeter and keep through traffic, freight, and city buses on that. In the interior (of that superblock), allow only local vehicles, traveling at very low speeds, under 10 mph. And make all the interior streets one-way loops (see the arrows on the green streets below), so none of them serve through streets."
from: http://www.vox.com/2016/8/4/12342806/barcelona-superblocks
It is an interesting idea but in the past, planners have tried to design cities without superblocks. On one hand, the plan below of the Hudson Yards maintains the street grid and fronting the buildings to the street, but some developers defend superblocks - "while it may be a disservice to the city to have a large, island-like superblock - traffic flow is disrupted, walking and bicycling trips are made more difficult -- to the developer, a superblock allows for wide floor plates, campus-like settings and a level of land use control that would not otherwise be possible."
from: http://www.streetsblog.org/2008/02/22/lets-chop-up-superblocks/
However, according to a ULI article, "developers in China are accustomed to developing superblocks, which can house thousands of people, largely cut off from the surrounding city. “Five thousand units [of residential space] creates fear and alienation because people don’t know each other, kids don’t know each other,” Calthorpe said. And that fear leads people to wall off their superblocks, creating private courtyards and other amenities solely for the use of residents, much like gated communities in the United States." Peter Calthorpe "urged development of Asian cities at a more human, walkable scale, replacing massive two-way streets with one-way street couplets that carry more traffic more efficiently."
However, according to a ULI article, "developers in China are accustomed to developing superblocks, which can house thousands of people, largely cut off from the surrounding city. “Five thousand units [of residential space] creates fear and alienation because people don’t know each other, kids don’t know each other,” Calthorpe said. And that fear leads people to wall off their superblocks, creating private courtyards and other amenities solely for the use of residents, much like gated communities in the United States." Peter Calthorpe "urged development of Asian cities at a more human, walkable scale, replacing massive two-way streets with one-way street couplets that carry more traffic more efficiently."
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