Suffix used in compound words to indicate a route or road, such as in 街道 (highway) or 通路 (passage). Not used as a standalone noun.
The 路 in 街道 is a suffix meaning a route or road.
distance travelled in a day
Rare suffix indicating a day's travel distance, found in classical or historical contexts. Not productive in modern Japanese.
In classical texts, 路 was used as in 一日路 to indicate a day's journey.
one's ... (age, e.g. 40s, 60s)
Suffix attached to numbers to indicate a decade of age, as in 四十路 (one's forties) or 七十路 (one's seventies). Somewhat literary or old-fashioned; 代 (だい) is more common in modern speech.
See also: 七十路
He has just entered his forties.