What is the primary purpose of demarcation lights on an escalator?

The primary purpose of demarcation lights on an escalator is to ensure passenger safety. These lights serve as a visual guide at the escalator's entrance and exit points, helping to delineate the boundaries of the moving steps. This is crucial for preventing accidents, as they alert passengers to where they should step on and off the escalator. By clearly marking these areas, demarcation lights reduce the risk of missteps that could lead to injuries.

While there are other features and lighting that can enhance the aesthetic appeal or ambiance of an escalator, the critical function of demarcation lights is rooted in safety. Proper visibility and a clear indication of movement can significantly improve the passenger experience by minimizing the likelihood of falls or miscalculations when entering or exiting the escalator.