When Was the Macadamized Road Invented?

Macadam is a type of road construction, pioneered by Scottish engineer John Loudon McAdam

around 1820, in which single-sized crushed stone layers of small angular stones are placed in shallow lifts and compacted thoroughly.

When was the Macadamized road built?

1823 - First American Macadam Road

The first macadam surface in the United States was laid on the "Boonsborough Turnpike Road" between Hagerstown and Boonsboro, Maryland.

Who invented the modern road?

Two other Scottish engineers, Thomas Telford and John Loudon McAdam are credited with the first modern roads. They also designed the system of raising the foundation of the road in the center for easy water drainage.