The limits on the run, together with those on the rise, control the steepness of stairs, which is also a factor in accidents. The minimum run, which is equal to the minimum tread depth, is intended to provide sufficient room to accommodate the length of a foot. Insufficient tread depth causes users to walk sideways to get sufficient foot support, increasing the risk of missteps. The maximum run, on the other hand, is intended to prevent users from having to take more than a single stride between steps, which would decrease the speed of travel. The maximum tread depth is intended to prevent excessive nosing projection.
The dimensional requirements for steps with rectangular treads in private and public stairs are summarized in Figure 9.8.-2.
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