Solid barrier protecting the lift's runway area.

• A. Runway Enclosure
• B. LULA
• C. Self-Closing Door
• D. Mechanical Lock

Answer: (A)

A solid barrier around the moving run surface is what protects people from the hazards of the escalator’s runway. The Runway Enclosure provides that continuous, sturdy barrier around the entire runway area, effectively enclosing the moving steps and tracks so there’s no gap for fingers, clothing, or objects to reach into the danger zone while the machine operates.

The other options don’t serve that specific protective role. A LULA refers to a different type of elevator used in certain buildings and isn’t about enclosing the escalator’s runway. A self-closing door helps prevent access to a space but doesn’t by itself enclose and protect the entire runway area. A mechanical lock is a security feature for doors or enclosures, not the barrier that physically surrounds and protects the runway.