If exploration finds a hidden route, any noble in the player's faction will be able to use it.
> explore A hidden route has been found! South, to Plain [ce21], 7 days
The location description for this place will now include the hidden route:
Plain [cd21], plain, in region Tollus Routes leaving Plain [cd21]: North, to Plain [cc21], 7 days South, to Plain [ce21], 7 days, hidden East, to Plain [cd22], 7 days West, to Plain [cd20], 7 days
However, units from other factions, even if they know that the hidden route's entity number is [ce21], will not be able to travel across it.
All factions with units in a stack traveling across a hidden route, with the exception of units being held prisoner, will learn of its existence. Nobles from factions wanting to learn how to use the hidden route can stack with a noble about to move across the route.