हु इनवेंटेड द मेथड ऑफ मेकिंग ऑफ पक्का रोड
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Macadam, form of pavement invented by John McAdam of Scotland in the 18th century. McAdam's road cross section was composed of a compacted subgrade of crushed granite or greenstone designed to support the load, covered by a surface of light stone to absorb wear and tear and shed water to the drainage ditches.
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