the.com/macadam
a Scottish surveyor's crushed-stone gospel that paved the planet long before tar showed up.
means A road surface made of layers of small, crushed, compacted stones, the engineered ancestor of the smooth roads we drive on today.
from Straight from the man himself: John Loudon McAdam, the Scottish road engineer whose method of building roads from carefully graded crushed stone was so successful that his surname became the surface. When tar was later added to bind the stones against dust and rain, the word grew a tail — 'tarmacadam,' soon clipped to 'tarmac.' So 'macadam' is one of those rare words that is simply a person, immortalized in gravel.
- named after
- John Loudon McAdam, 1820s road obsessive
- original recipe
- crushed stone, no tar at all
- tarmac twist
- adding tar later birthed the word tarmac
- genius trick
- angular stones lock together under traffic pressure
- drainage rule
- raised camber so water ran off, not in
telford's holyhead road wales — thomas telford's competing macadam-style road built 1815-1830, spanning 260 miles from london to wales