Road surfacing material is a term used to describe the materials used to construct and maintain roads. Common materials used for road surfacing include TAR (3 letters), ASPHALT (7 letters), BITUMEN (7 letters) and MACADAM (7 letters). TAR is a dark, viscous material made from coal, wood or petroleum. ASPHALT is a mixture of BITUMEN and aggregates such as sand and gravel. BITUMEN is a black, sticky substance derived from petroleum. MACADAM is a type of road construction consisting of layers of crushed stone and gravel.