A driveway is a type of private road for local access to one or a small group of structures, and is owned and maintained by an individual or group. Driveways may be decorative in ways that public roads cannot, because of their lighter traffic and the willingness of owners to invest in their construction. Driveways are not resurfaced, snow blown or otherwise maintained by governments. They are generally designed to conform to the architecture of connected houses or other buildings. Materials used for driveways include concrete, decorative brick, cobblestone, asphalt, and decomposed granite, surrounded with grass or other ground-cover plants.