i learned why do escalators have these brushes on the sides near the feet.
Many people have to put their feet on these brushes to benefit from them and already do some cleaning on their shoes. But that's not quite the point of these brushes.
Escalators break when you get too close to the edges. If you look at the figure above again, you will notice that each step has a yellow border around it. this should be a warning to stay away from the sides. There's a small gap between the sides of the escalator and the maze of gears and motors below, and when things get into that gap, that's when the escalator breaks down.
Worse yet, when human body parts enter this tiny crack, the machine is usually powerful enough to cause real harm to the person.
The brushes ? They help prevent these accidents. As escalator supply company Schindler points out, “The safest way to avoid leg injuries is to keep shoes, feet and hands from getting near the gap in the first place. "
So if you're not careful or don't notice the yellow warnings, the brushes can stop you from doing something dangerous without you realizing it.
Last week I saw a show about how escalators can just open and grind an arm or a leg so this photo just creeps me out. It's in an abandoned theme park in Japan.
The one time I tried, I got hit by a slinky going down at double speed.
Escalators [Explained]
Transcript Under the Cut
[A graph with y-axis titled "Urge to try running up the down escalator," with "weak" by the bottom and "strong" by the top. The x-axis has every two years labeled and every year signified by a smaller mark, which stops at 24. A red line with "What I was supposed to feel" with points at every line rises, peaks at 7 years old, then falls "tangent graph" shaped until the end. The graph is shaped like an escalator with the last Cueball having just dismounted. Along this line are shown various Cueball-like figures at 12, 14, 20, and 24. A second red line runs "What I've actually felt," which stays consistently high.]