To supersede the requirements of Sentence 3.4.3.2.(1) and allow a relaxation in the width of means of egress, on the basis that there is a lower exposure risk to occupants in an exterior environment.
This is to limit the probability that means of egress will be of insufficient width to permit efficient egress in an emergency situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.