Why Do Escalator Steps Have Teeth?

Have you ever noticed the small grooves and yellow lines on escalators? 🤔 At first glance, they might seem like ordinary design details, but they actually play a crucial role in keeping escalators safe and running smoothly. In this video, we’ll explore the hidden engineering behind this familiar machine—from how the steps “disappear” into the system to how those tiny grooves help reduce the risk of getting caught or injured. You might also be surprised to learn that these seemingly simple details are the result of over a century of engineering improvements. Once you see it, you may never look at escalators the same way again. Chapter: 00:00 - Intro 00:29 - Internal structure of an escalator 01:17 - Why do escalators have grooves? 02:15 - The most dangerous part of an escalator 03:23 - Yellow line and black brush? 04:20 - History of Improvement 05:04 - Outro If you enjoyed this video, please like and subscribe for more. And don’t forget to leave a comment below telling me what everyday question you’ve always been curious about.