To exempt mezzanines serving certain major occupancies from the requirements of Sentence 3.2.8.1.(1) and Articles 3.2.8.3. to 3.2.8.8., which would otherwise require a vertical fire separation or certain fire protection measures, on the basis that the mezzanine area is limited in size and sufficiently open to allow occupants to detect a threat to their safety and not be excessively delayed in reaching an exit.