A handrail may project a maximum of how many inches into the required stair width?

The maximum projection of a handrail into the required stair width is limited to 4 1/2 inches to ensure a safe and accessible passageway on the stairs. This regulation helps maintain sufficient space for users navigating the stairs, especially in emergency situations where individuals may need to move quickly. Allowing too much projection can create hazards, as it may restrict movement or lead to individuals bumping against the handrail while walking, particularly if they are carrying items or if the stairway is narrow. Compliance with this measurement is essential for safety protocols and building codes, which aim to prevent accidents and ensure that stairways remain functional for all users.