Add to that the fact that lanes follow animal trails, roads follow lanes, avenues connect lanes or simply increase their capacity....and:
Eventually, a druid road can easily become a roman road.
Or, Route 66 becomes a side note to the interstate system.
Generations add techniques and/or specialization (skids vs two wheels vs four wheels, etc.)...
Purpose pretty much remains the same.
Makes sense. The road is where it is for some reason.
... and the width of a roman horses’ ass defines the diameter of the booster rockets for the space shuttle.
Snopes says that myth is wrong - actually, Snopes is wrong - the myth is true.
Case in point, northeastern New Jersey.
Deer paths became indian trails became dirt roads became the first paved highways in the southern US in a mere three to four centuries time.
Only with the advent of multilane roads and interstates have the old, natural routes been passed over. So, it’s easily observed. The best route is the best route and recognized by animals, Celts or even Romans. Who’d have thunk, lol?