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RDDENSCROA - Road density of surface roads Surface street density is calculated by summing the length of surface
streets and dividing by the area of the 1 km grid cell reporting
unit. Values are reported as km of road class per km2. High road
densities are generally well correlated with high human population
and urban development. Roads increase imperviousness, potentially
decreasing water quality. Roads also fragment habitat and may act
as barriers, especially to large mammals. Wider roads and higher
traffic volumes will generally have more adverse affects, and impact
a larger surrounding area then smaller, less traveled roads. |