Where the continuous support of the treads and the lesser loading due to the nature of the occupancy allow a greater span between stringers, to limit the probability of excessive space between stringers, which could lead to structural failure of the stringers, which could lead to harm to persons.
To supersede the requirement stated in Clause 9.8.9.4.(1)(d) regarding the maximum distance between stringers, where the continuous support of the treads and the lesser loading due to the nature of the occupancy allow a greater span between stringers.