Encyclopedia
Macadam
Macadam consists of coarsely sorted crushed stones, gravel, slag, scoria or similar industrial waste, or mixtures of these materials. When mixed with tarmac, bitumen and so on, it is known as tarmacadam
Source: "Explanations to the Harmonized System of Foreign Economic Activity of the Russian Federation (HS FED Russia)" (prepared by the Federal Customs Service of Russia) (volume 1, sections I - VI, groups 1 - 29)