The term 'road-paving material' refers to the materials used to construct and maintain roads. Two common materials used for this purpose are TAR and BLACKTOP. TAR is a dark, viscous material made from the distillation of coal, wood, or petroleum. It is often used as a waterproofing agent and is also used in road construction. BLACKTOP is a type of asphalt pavement, which is a mixture of aggregate, sand, and bitumen. It is commonly used for paving roads and other surfaces.