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3.4.5.2.(1)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Signs for exit ramps or stairways that continue up or down past the lowest exit level in a building more than 2 storeys in building height.
This applies to exits serving floor areas that are intended for occupancies, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A. that are more than 2 storeys in building height.
Application 2: 
This also applies to tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1).
Exceptions: 
except as stated in:
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Intent
Intent 1: 
To limit the probability that persons using an exit ramp or stairway in an emergency situation will continue past the lowest exit level, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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