Paving stuff refers to materials used in the construction of roads and other paved surfaces. The most common paving stuff includes TAR, ASPHALT, and MACADAM. TAR is a dark, viscous material made from coal and wood that is used as a waterproofing agent. ASPHALT is a mixture of bitumen and aggregate that is used to create a smooth, durable surface. MACADAM is a type of road construction that involves layers of crushed stone and gravel bound together with TAR or ASPHALT.