Elementary processes governing the evolution of road networks
Open Access
- 1 March 2012
- journal article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 2 (1), 296
- https://doi.org/10.1038/srep00296
Abstract
Urbanisation is a fundamental phenomenon whose quantitative characterisation is still inadequate. We report here the empirical analysis of a unique data set regarding almost 200 years of evolution of the road network in a large area located north of Milan (Italy). We find that urbanisation is characterised by the homogenisation of cell shapes, and by the stability throughout time of high–centrality roads which constitute the backbone of the urban structure, confirming the importance of historical paths. We show quantitatively that the growth of the network is governed by two elementary processes: (i) ‘densification’, corresponding to an increase in the local density of roads around existing urban centres and (ii) ‘exploration’, whereby new roads trigger the spatial evolution of the urbanisation front. The empirical identification of such simple elementary mechanisms suggests the existence of general, simple properties of urbanisation and opens new directions for its modelling and quantitative description.Keywords
This publication has 29 references indexed in Scilit:
- Time for a change: dynamic urban ecologyTrends in Ecology & Evolution, 2012
- Monitoring urbanization in mega cities from spaceRemote Sensing of Environment, 2012
- Urban growth, climate change, and freshwater availabilityProceedings of the National Academy of Sciences of the United States of America, 2011
- Spatial networksPhysics Reports, 2011
- Multiscale mobility networks and the spatial spreading of infectious diseasesProceedings of the National Academy of Sciences of the United States of America, 2009
- Health and Urban LivingScience, 2008
- The emergence of land change science for global environmental change and sustainabilityProceedings of the National Academy of Sciences of the United States of America, 2007
- Growth, innovation, scaling, and the pace of life in citiesProceedings of the National Academy of Sciences of the United States of America, 2007
- Centrality measures in spatial networks of urban streetsPhysical Review E, 2006
- Modelling the post-industrial cityFutures, 1997