Citation

Strano E, Giometto A, Shai S, Bertuzzo E, Mucha PJ, Rinaldo A. R. Soc. Open Sci. 2017; 4(10): e170590.

Affiliation

Department of Civil, Environmental and Architectural Engineering, University of Padova, Padova 35131, Italy.

Copyright

(Copyright © 2017, Royal Society Publishing)

DOI

10.1098/rsos.170590

PMID

29134071

PMCID

PMC5666254

Abstract

Because of increasing global urbanization and its immediate consequences, including changes in patterns of food demand, circulation and land use, the next century will witness a major increase in the extent of paved roads built worldwide. To model the effects of this increase, it is crucial to understand whether possible self-organized patterns are inherent in the global road network structure. Here, we use the largest updated database comprising all major roads on the Earth, together with global urban and cropland inventories, to suggest that road length distributions within croplands are indistinguishable from urban ones, once rescaled to account for the difference in mean road length. Such similarity extends to road length distributions within urban or agricultural domains of a given area. We find two distinct regimes for the scaling of the mean road length with the associated area, holding in general at small and at large values of the latter. In suitably large urban and cropland domains, we find that mean and total road lengths increase linearly with their domain area, differently from earlier suggestions. Scaling regimes suggest that simple and universal mechanisms regulate urban and cropland road expansion at the global scale. As such, our findings bear implications for global road infrastructure growth based on land-use change and for planning policies sustaining urban expansions.

Language: en

Keywords

global land use; global road network; spatial networks; urbanization