9.—(1) A person in the vicinity of the barrier must carry out the reasonable instructions of an authorised person and the requirements of any notice displayed by the Agency.
(2) A person must not obstruct an authorised person acting in the course of the duties of the authorised person.
(3) A person is not liable for breach of a byelaw while acting in compliance with the express instructions of an authorised person.
(4) A person is not liable for breach of a byelaw by disobeying a notice unless it is proved to the satisfaction of the Court before whom the complaint is laid that the notice referred to in the particular byelaw was displayed.