Map of the Road Ruggedness Scale (RRS)
![Map of the Road Ruggedness Scale (RRS) Map of the United States showing the five levels of the Road Ruggedness Scale.](/webdocs/charts/108235/fig_2_rugged_terrain_768px.png?v=3664.1)
The intersection of rugged terrain and economic activity remains understudied, so USDA, Economic Research Service researchers developed two classifications of U.S. census tracts: the six-level Area Ruggedness Scale and the five-level Road Ruggedness Scale.
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