Keep in mind that roads and paths are not marked "private" unless there's a good reason (in Finland) and it's rather rare. It is not enough that it's a private road (yksityistie), because jokaisenoikeudet/everyman's right allows access on private roads in most cases, and especially so on foot/bicycle.
It is a good reason to mark a private home's yard, such as here, private, but not so much on the other roads around the yard/lot
Check the publication Jokamiehenoikeudet ja toimiminen toisen alueella if you want to learn more.