Small nitpick: driveways leading to houses are service roads (and a service road can be a driveway too).

Unclassified, despite its name, in Estonia is often used for non-residential not very important roads. Usually they have more than 5-digit reference number in road registry.

https://wiki.openstreetmap.org/wiki/Tag:highway%3Dunclassified

https://wiki.openstreetmap.org/wiki/Tag:service%3Ddriveway