Sentence 9.8.4.3.(1)

  1. OS3

Objective

OS3 Safety in Use

Attribution

Intent

Intent 1:

To limit the probability that an insufficient run in a curved flight will not provide adequate support for users' feet, which could lead to:

  • persons falling during normal use -- when traffic flow is likely to be lower than for exit stairs during an emergency and users are likely to have the option of using the wider portion of the treads, or
  • persons falling in an emergency -- when traffic flow is expected to be limited because of the presence of exit stairs as an alternate or the limited occupancy in a dwelling unit, and users are likely to have the option of using the wider portion of the treads -- which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.

This is to limit the probability of harm to persons.

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