Handrails within dwelling units are allowed to be interrupted by a newel post at which of the following?

Handrails within dwelling units are permitted to be interrupted by a newel post at both turns and landings because these structural features provide necessary support and enhance safety for users. At turns, a newel post helps to maintain the continuity of the handrail while also allowing for a change in direction, ensuring that individuals can safely navigate corners without losing grip.

At landings, a newel post offers additional stability where the handrail transitions from a flight of stairs to a flat area, which can be particularly useful for users when they are preparing to change direction or exit the stairway. This design is also in line with building codes that emphasize user safety and accessibility, ensuring that handrails can maintain their functionality while incorporating necessary structural elements.

The other options suggest that handrails should remain uninterrupted, which could compromise their functionality and safety in areas where structural features like turns and landings exist.