What is the maximum height that the bottom or top riser may be reduced to when adjoining a sloping public way, walkway, or driveway?

• A. 4 inches
• B. 3 inches
• C. 2 inches
• D. 1 inch

Answer: (A)

The maximum height that the bottom or top riser may be reduced to when adjacent to a sloping public way, walkway, or driveway is specified as 4 inches. This regulation is in place to ensure safety and accessibility for individuals using stairs that lead directly to areas that may be uneven or sloped.

Reducing the riser height to a minimum of 4 inches helps to prevent tripping hazards and provides a smoother transition to the adjacent surface, making it easier for people, including those with mobility issues, to navigate the stairs. A higher riser, while still compliant, could increase the risk of falling if the adjacent walkway is steep or uneven. Therefore, setting the limit at 4 inches is a balanced approach between safety, usability, and construction standards.

The other options suggest lower maximum heights, which could be impractical in many scenarios and potentially compromise overall safety standards when transitioning from raised structures to sloped surfaces.