In all hotels and multiple dwellings in which there are one or more self-service elevators, there shall be affixed and maintained in each elevator a mirror that will enable persons, prior to entering into such elevator, to view the inside thereof to determine whether any person is in such elevator.
N.J. Admin. Code § 5:10-12.4
See: 25 New Jersey Register 2627(a), 25 New Jersey Register 4482(a).