Is this a private way as in it's a road that only abutters can park on, or is this a shared driveway where you each have an easement on each other's deed?

P.S. Does anybody know what the legal status of a road marked "private way" is in Massachusetts? Certain neighborhoods ( the more "suburban" parts of Medford come to mind ) have "private way" marked on their street signs, but it's by no means a gated-community situation.