Usually a light-duty roadway that connects a public street to a garage where automobiles are stored.  When improperly installed or maintained, driveways can significantly increase the environmental impacts of a site by increasing and polluting runoff.  The impact of a driveway can be reduced by reducing the amount of paved area, by using permeable paving materials, and by designing the driveway to drain to an area where its runoff can be properly treated.