To limit the probability that vestibules, enclosed balconies or bridges that are used as parts of a horizontal exit 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.
To supersede the requirement for a minimum clear width in the first part of Sentence 3.4.6.10.(2) and permit the projection of handrails into this clear width, if the projection of the handrails is limited.