Metalled
The second edition of The Dictionary of Urbanism by Rob Cowan defines a metalled road as: 'One surfaced in road metal, in a late eighteenth century sense of the word metal, referring to the crushed rock that formed part of the system of building a sealed and waterproof road surface pioneered by the engineer John McAdam. Before that, metal referred to anything useful that had been extracted from the ground. The word comes from Latin metallum, a mine or quarry.'
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