John Loudon McAdam

Born in Ayr, Scotland, on September 21, 1756, he became one of the most influential road builders of the 19th century. He spent part of his early life in New York, returned to Britain, and later developed the road-building system that became known as macadamization.

His approach challenged older methods that relied on massive foundation stones. Instead, he argued that roads should be raised above the surrounding ground for drainage and built from carefully sized layers of broken stone compacted by traffic, creating a durable and efficient surface.

The success of that method spread widely, and his name became part of everyday language through the word "macadam." He died on November 26, 1836, but his ideas left a lasting mark on transport and civil engineering.