A tread (run) at the top of a stairway that is larger than the remaining treads produces a significant fall hazard. The user stepping down onto the first tread may expect subsequent treads to have the same dimension, and thus overstep the nosing on the next tread. This has led to serious falls. This condition, which may be due to inadequate planning when a stairway is attached to an upper landing, has been noted in both newer and older constructions.
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