road metal

noun British.
broken stone, cinders, etc., used for making roads.
Also called metal.

1810–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To road metal
World English Dictionary
road metal
crushed rock, broken stone, etc, used to construct a road

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
These gravels have been mined from hundreds of pits for fill, base material for
  paved roads, and road metal for secondary roads.
In this region the roads are surfaced with oyster shells, which make an
  admirable road metal for light traffic.
Limestone for building stone, quartzite for cement, and gravel for road metal
  have been mined in the area.
The dense lava making up this plug is suitable for use as road metal, and
  currently is quarried for that purpose.
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