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RDDENSCINT - Road density of interstates Interstate density is calculated by summing the length of interstates
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. |