The term 'road surfacing stuff' refers to materials used to create a smooth and durable surface for roads. The most common material used is TAR, which is a black, viscous liquid or semi-solid form of petroleum. TAR is heated and mixed with gravel and sand to form a strong and waterproof layer on the road surface. It is also used to fill cracks and holes in the road surface, making it more resistant to wear and tear. TAR is an essential component of road surfacing and is used in many countries around the world.