ZD:
You missed my point. DDMD is not the question here. If someone has established a pattern of access to his property, may I block it as per halacha? The matter of the legality of the driveway is not the issue. Maybe that person is in violation of halacha by virtue of Dina Demalchusa Dina. But he has been accessing his property, and has a chazakah of doing so for a long period of time. May I block him?