Metal - CDP Theme Day

Metal or metalling has had two distinct usages in road paving. Metalling originally referred to the process of creating a carefully engineered gravel roadway. The route of the roadway first would be dug down several feet. Depending on local conditions, French drains may or may not have been added. Next, large stone was placed and compacted, followed by successive layers of smaller stone, until the road surface was a small stone compacted into a hard, durable surface.

Road metal later became the name of stone chippings mixed with tar to form the road surfacing material tarmac. A road of such material is called a "metalled road" in British usage, or less often a macadam road, however the most common name applied to any road surface is "tarmac", regardless of it's actual construction. The word metal is derived from the Latin metallum, which means both "mine" and "quarry", hence the roadbuilding terminology.
(Sourced from Wikipedia)

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