Why Escalators Have Those Brushes on the Sides

Ever notice the long brushes running along the sides of an escalator? They look like they're perfectly positioned to clean your shoes — but that’s actually the opposite of what they’re designed to encourage. Those brushes are there because an escalator has a moving step, a fixed side panel, and a tiny gap between them. If a shoe, loose clothing, or another object gets too close to that area, it can become caught near the moving edge. The brushes act more like a soft warning zone. When your shoe drifts toward the side, you feel the bristles and instinctively move your foot back toward the middle of the step. In this video, we break down: Why escalators need a small gap beside the steps What the metal “skirt” panel actually is Why the brushes don’t seal or cover the gap How the brushes help keep riders away from the edge Why using them as a shoe cleaner is doing the exact opposite of what they were designed to encourage You’ve probably seen these brushes hundreds of times. Now you know why they’re there. Subscribe to Why Is That There? for visual explanations of the strange little features hiding in everyday objects, machines, buildings, vehicles, and public spaces. #Escalator #HowThingsWork #Engineering #EverydayThings #WhyIsThatThere