Macadam refers to a type of road construction technique that involves laying and compacting layers of crushed stone or gravel. Developed by Scottish engineer John Loudon McAdam in the early 19th century, the method emphasizes using well-graded aggregates to create a firm, stable surface. In macadam construction, the roadbed is typically layered: larger stones are placed at the bottom, with progressively smaller stones layered on top.
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