Millions of people ride escalators every day without noticing the small brushes running along their sides. Many assume these bristles are there to clean shoes, but their primary purpose is related to **passenger safety**. Positioned where the moving steps meet the stationary side panels, they encourage riders to keep their feet, clothing, bags, and other belongings away from the edges.

The brushes act mainly as a **tactile warning**, rather than a physical barrier. If a shoe, piece of clothing, or bag touches the bristles, the sensation can prompt a passenger to move toward the center of the step. This is important because escalators contain narrow clearances between moving and stationary components, where loose clothing, shoelaces, or other objects can potentially become caught. The brushes don’t eliminate the hazard, but they provide a simple reminder to maintain a safer position.

So, the next time you step onto an escalator, pay attention to those seemingly ordinary bristles. Keep your feet toward the center, hold the handrail when appropriate, and keep loose clothing and belongings away from the sides. They may look like simple cleaning brushes, but their more important role is to **encourage safer passenger behavior around the edges of the escalator**.