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Road networks represent a key component of human settlements, such as cities,towns, and villages, that mediate pollution and congestion, as well as economicdevelopment. However, little is known about the long-term developmenttrajectories of road networks in rural and urban settings. We leverage novelspatial data sources to reconstruct and analyze road networks in more than 850US cities and over 2,500 US counties since 1900. Our analysis revealssignificant variations in the structure of roads both within cities and acrossthe conterminous US. Despite differences in the evolution of these networks,there are commonalities and strong geographic patterns. These results persistacross the rural-urban continuum and are therefore not just a product ofaccelerated urban growth. These findings refine and extend existing knowledgeand illuminate the need for policies for urban and rural planning including thecritical assessment of new development trends.

Road Network Evolution in the Urban and Rural United States Since 1900