Global trends toward urban street-network sprawl.

Clicks: 313
ID: 82396
2020
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Ranked #85 of 292 articles by views in Proceedings of the National Academy of Sciences of the United States of America

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Abstract
We present a global time series of street-network sprawl-that is, sprawl as measured through the local connectivity of the street network. Using high-resolution data from OpenStreetMap and a satellite-derived time series of urbanization, we compute and validate changes over time in multidimensional street connectivity measures based on graph-theoretic and geographic concepts. We report on global, national, and city-level trends since 1975 in the street-network disconnectedness index (SNDi), based on every mapped node and edge in the world. Streets in new developments in 90% of the 134 most populous countries have become less connected since 1975, while just 29% show an improving trend since 2000. The same period saw a near doubling in the relative frequency of a street-network type characterized by high circuity, typical of gated communities. We identify persistence in street-network sprawl, indicative of path-dependent processes. Specifically, cities and countries with low connectivity in recent years also had relatively low preexisting connectivity in our earliest time period. We discuss implications for policy intervention in road building in new and expanding cities as a top priority for sustainable urban development.
Reference Key
barringtonleigh2020globalproceedings Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Barrington-Leigh, Christopher;Millard-Ball, Adam;
Journal Proceedings of the National Academy of Sciences of the United States of America
Year 2020
DOI
201905232
URL
Keywords
transportation urban development urban sprawl climate change policy

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