What is the maximum distance a handrail on one side can project into the minimum clear width of existing exit stairs?

The correct answer indicates that a handrail on one side can project a maximum of 114 mm into the minimum clear width of existing exit stairs. This specific measurement is critical in building design and safety standards, as it ensures that there is sufficient space for individuals to use the stairs safely and comfortably.

By allowing handrails to project only this limited distance, the design helps to maintain a clear pathway for evacuation during emergencies, reducing the risk of accidents such as trips or falls. A narrow obstruction, such as a handrail, that remains within this limit provides support without compromising the effectiveness and accessibility of the exit stairs.

The other options reflect greater projections, which could hinder movement, especially in emergency situations where evacuation speed is crucial. Adhering to the established guidelines for handrail projection is essential for compliance with the building codes that prioritize accessibility and safety for all users.