cement stair design for small house,Why is a live load considered more in the stair design than in a one-way slab?

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Slab stairs Design

Common areas like stairways and elevator approached have higher design loads to compensate for more people using it at one time.

Generally, slab live loads are figured based on disbursed loading (people moving about) whereas stairways need to allow for many people, in case of emergencies.