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century of sprawl in the United States
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Journal Article
century of sprawl in the United States
2015
Overview
The urban street network is one of the most permanent features of cities. Once laid down, the pattern of streets determines urban form and the level of sprawl for decades to come. We present a high-resolution time series of urban sprawl, as measured through street network connectivity, in the United States from 1920 to 2012. Sprawl started well before private car ownership was dominant and grew steadily until the mid-1990s. Over the last two decades, however, new streets have become significantly more connected and grid-like; the peak in street-network sprawl in the United States occurred in â¼1994. By one measure of connectivity, the mean nodal degree of intersections, sprawl fell by â¼9% between 1994 and 2012. We analyze spatial variation in these changes and demonstrate the persistence of sprawl. Places that were built with a low-connectivity street network tend to stay that way, even as the network expands. We also find suggestive evidence that local government policies impact sprawl, as the largest increases in connectivity have occurred in places with policies to promote gridded streets and similar New Urbanist design principles. We provide for public use a county-level version of our street-network sprawl dataset comprising a time series of nearly 100 y.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ Cities
/ City Planning - legislation & jurisprudence
/ City Planning - statistics & numerical data
/ climate
/ Environment Design - legislation & jurisprudence
/ Environment Design - statistics & numerical data
/ Humans
/ policy
/ Transportation - statistics & numerical data
/ Urban Renewal - legislation & jurisprudence
