I am a lawyer and have no idea as to the official answer to t his question, but then we don't have that many private roads in Jersey.
We have a house on a private road in Alton that is at the end of a public road. The town does not pave or plow it. We have to pay the association to have that done. On the other hand, when we stayed on the public part of the road (we moved later on), I would never walk down on to the private part. Private there meant keep out, but there was also a really big sign to alert us that it was private. That sign is long gone.
__________________
|