An employer, self-employed person or user shall ensure that entry and exit from danger areas is only permitted -
(a) at the permanent authorized point of entry or exit: Provided that entry or exit at any other point may be authorized by the explosives manager or a person authorized by him if the authorized gatekeeper has been informed thereof;
(b) for persons and vehicles authorized thereto by the explosives manager or a person authorized by him; and
(c) to visitors under escort by an authorized person who is aware of the hazards attached to the danger area.