private road
US /ˈpraɪ.vət roʊd/
UK /ˈpraɪ.vət roʊd/

1.
a road that is owned and maintained by a private individual or organization rather than by the government or public authorities
:
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The sign clearly stated, "Private Road, No Trespassing."
•
Access to the lake house is via a long, winding private road.