What is one of the requirements for easily accessible stairs in a building?

The requirement for easily accessible stairs in a building is tied to the minimum illumination level that must be maintained for safe and effective use. The correct answer, which specifies 150 lux, is based on the need to ensure that stairways are adequately lit to reduce the risk of accidents and enhance visibility for users. This level of illumination supports both safety and usability, allowing individuals to navigate stairs comfortably, particularly in low-light conditions.

While it is important for stairways to be well-lit, achieving a balance is vital to prevent excessive brightness that could cause discomfort or distractions. The selection of 150 lux reflects a standard that is practical for residential and commercial settings, ensuring that the lighting is sufficient for users without creating glare.