Define highway material

Highway materials are all the natural and manufactured materials used in the construction, strengthening and maintenance of roads and pavements. They include soil (subgrade, embankment), aggregates (stone, gravel, sand), binders (bitumen, cutback, emulsion, tar, cement, lime), bituminous mixes, concrete, geosynthetics and steel; the engineering of highway materials deals with their properties, tests and use in each pavement layer.