John Loudon McAdam (23 September 1756 [1] – 26 November 1836) was a Scottish civil engineer and road-builder. He invented a new process, "macadamisation", for building roads with a smooth hard surface, using controlled materials of mixed particle size and predetermined structure, that would be more durable and less muddy than soil -based tracks.

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John Loudon McAdam was a Scottish inventor of the macadam road surface. In 1770 he went to New York City, entering the countinghouse of a merchant uncle; he returned to Scotland with a considerable fortune in 1783. There he purchased an estate at Sauhrie, Ayrshire. McAdam, who had become a road

John McAdam changed road building by creating a cheaper and more durable way with macadam roads. Macadam roads were the start of what we now know as tarmac and even asphalt roads. Macadam roads helped cities connect, aiding in events like the Civil War treaty talks.

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McAdams is a full-service civil engineering, land planning, surveying, landscape architecture, water resources, transportation, and construction administration firm with offices across Florida, North Carolina, South Carolina, and Texas.