1. OS3


OS3 Safety in Use



Intent 1:

To limit the probability that excessive variance in the configuration of a stair will excessively disrupt the gait of users, which could lead to:

  • persons misstepping and tripping, or
  • persons misstepping and tripping in an emergency -- when traffic flow is expected to be limited owing to the presence of exit stairs as an alternate option or to the limited number of occupants in dwelling units -- which could lead to delays in the evacuation or movement of persons to a safe place.

This is to limit the probability of harm to persons.

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