Why Escalators Have Brushes on the Sides: The Surprising Reason Most People Don’t Know

Have you ever stepped onto an escalator in a shopping mall, airport, or train station and noticed the thin rows of brushes running along both sides?

Most people have seen them hundreds of times. Some might have brushed their shoes against them while riding upward. Others may have assumed they were designed to clean dust from the steps or keep the escalator looking tidy.

But what if those little brushes serve a much more important purpose?

The truth is that escalator brushes are primarily designed to improve passenger safety. They help discourage people from standing too close to the edges, where moving steps meet stationary side panels. This seemingly minor detail is part of a broader approach to reducing the risk of clothing, shoes, and other objects becoming trapped in moving machinery.

It is a fascinating example of how an everyday object can have a purpose that most people never stop to consider.

So, before you take your next ride on an escalator, here is what you should know about those mysterious brushes, how they work, and why you should never use them to clean your shoes.

1. The Mystery Behind the Brushes
Escalators are so common that most of us barely think about how they work.

We step onto the moving stairs, hold the handrail if necessary, and allow the machine to carry us between floors. We use them in shopping centers, airports, hotels, office buildings, and public transportation stations.

Because the experience is familiar, we rarely examine the smaller details.

The brushes along the edges are a perfect example.

They usually consist of rows of short, stiff bristles attached to the stationary side panels beside the moving steps. Depending on the escalator, the bristles may be black, gray, or another color that contrasts with the surrounding metal.

At first glance, their purpose seems obvious: perhaps they sweep away dust or help keep the edges clean.

Although they may incidentally help manage some debris, their principal purpose is safety.

The brushes provide a noticeable boundary between passengers and the sides of the escalator. If your shoe or clothing comes too close, you may feel the bristles and instinctively move away from the edge.

That small reminder can help prevent passengers from getting too close to a potentially hazardous area.

2. What Is the Dangerous Gap on an Escalator?
To understand why the brushes matter, it helps to look at how an escalator is constructed.

An escalator has moving steps that travel along a continuous mechanical track. Along each side is a stationary panel, commonly called the skirt panel.

A small clearance exists between the moving steps and these stationary panels. The steps need room to move smoothly, so eliminating every gap is not a practical solution.

However, the area where moving and stationary components meet can present an entrapment hazard.

Shoelaces, loose clothing, soft footwear, and other objects can become caught if they enter the wrong place.

A passenger might not realize how close their foot is to the edge until they feel the side brush against their shoe.

This is where the brushes become useful.

They provide a tactile warning that encourages passengers to keep their feet farther from the sides.

Manufacturers also use other safety features, including protective skirt designs, comb plates, monitoring systems, and emergency stopping mechanisms. The exact features vary by escalator model.

The brushes are only one part of a larger safety system, but they demonstrate how even a small design detail can help influence passenger behavior.Are Escalator Brushes Really Designed to Clean Shoes?
This is one of the most common misconceptions about escalators.

Because the brushes sit directly beside the moving steps, some passengers assume they are intended to clean shoes as people travel between floors.

The idea sounds reasonable. After all, brushes are commonly used to remove dust and dirt from surfaces.

However, escalator side brushes are not intended to function as shoe cleaners.

Deliberately rubbing your footwear against them can bring your shoes closer to the gap between the steps and the side panels—the very area you should avoid.

This is particularly important for children, whose small feet may move closer to the edges while they are looking around or playing.

It is also worth remembering that soft or flexible materials can behave unpredictably around moving machinery.

Instead of treating the brushes as convenient cleaning tools, passengers should view them as a reminder to maintain a safe position.

If your shoes are dirty, clean them somewhere appropriate after leaving the escalator.

A few seconds of convenience are not worth creating an unnecessary risk.

How Do the Brushes Help Keep Passengers Safe?
The brushes work primarily by discouraging passengers from approaching the edges.
Imagine standing on an escalator while looking at your phone. Without paying attention, you shift your feet slightly toward one side.

Your shoe touches the bristles.

You feel the unfamiliar texture and instinctively move your foot inward.

That small adjustment is exactly the kind of response the brushes are intended to encourage.

They provide a physical signal without requiring passengers to read a warning sign or hear an announcement.

This is an example of safety-conscious design: the environment itself helps remind people how to behave.

The brushes do not form an impenetrable barrier, and they cannot guarantee that an accident will never occur. They are flexible, and a sufficiently determined or unfortunate movement can still bring an object dangerously close to the machinery.

Their purpose is to reduce risk by encouraging safer positioning.

According to escalator manufacturer Otis, brushes and other protective features form part of the design measures used to help prevent entrapment and keep passengers away from hazardous areas.

It is a simple concept, but one that becomes more meaningful when we remember how many people use escalators every day.

Why Not Eliminate the Gap Completely?
A natural question follows: if the gap is dangerous, why not design escalators so that no gap exists?
The answer involves mechanical engineering.

Escalator steps must move continuously along a track while supporting passengers and handling repeated changes in direction.

The steps, rollers, tracks, and stationary panels must work together without excessive friction or interference.

The design therefore needs carefully controlled clearances.

Removing all clearance is not as simple as fitting the components tightly together. The machine must accommodate movement, manufacturing tolerances, wear, and maintenance requirements.

Instead, engineers use a combination of design controls and safety features to reduce the risks associated with moving parts.

These measures may include protective brushes, skirt panels, comb plates, warning markings, and devices that detect certain mechanical problems.

The brushes help address the human side of the problem: even when the equipment is properly designed, passengers still need to keep their feet, clothing, and belongings away from hazardous areas.

Good safety design combines suitable machinery with sensible passenger behavior.

Why Children Need Special Attention on Escalators
For adults, an escalator may feel like an ordinary part of a shopping trip.
For young children, however, it can seem like a moving playground.

Children may be fascinated by the steps, the handrails, and the brushes along the sides. They might lean toward the edge, attempt to touch the bristles, or move their feet around while riding.

These behaviors can create unnecessary risks.

Parents and caregivers should supervise children closely and explain that escalators are transportation equipment, not toys.

Hold a young child’s hand when appropriate, help them step on and off safely, and discourage them from touching the side brushes or placing their hands near moving parts.

Strollers and other wheeled devices should not be taken onto escalators unless the equipment’s instructions and local safety guidance explicitly permit it. Elevators are generally the better option for transporting strollers and many mobility devices.

Children should also be reminded to keep their feet on the steps and avoid sitting, running, or playing while the escalator is moving.

A calm explanation can go a long way toward helping children understand that seemingly harmless actions can become dangerous around machinery.

What About Shoelaces, Long Clothing, and Shopping Bags?
The brushes are particularly relevant when passengers are wearing or carrying items that could approach the sides of an escalator.
Long shoelaces, loose trousers, flowing skirts, scarves, and dangling bag straps can create hazards if they get too close to moving components.

This does not mean that wearing a particular style of clothing automatically makes escalator use unsafe. The important consideration is whether loose material can enter a gap or become trapped.

Before stepping onto an escalator, check that your shoelaces are tied and that loose clothing is secured.

Keep shopping bags under control rather than allowing them to drag across the steps or hang close to the edges.

Avoid leaning against the side panels, and do not allow children to play with dangling straps or other objects while riding.

When stepping on or off, pay attention to the movement of the steps and make sure you have stable footing.

These precautions are simple, but they help reduce the chance of an ordinary journey becoming an emergency.

What Other Safety Features Do Escalators Have?
The side brushes are only one part of modern escalator safety.
Many escalators include additional features designed to help prevent accidents or detect problems.

Comb plates: These are the toothed plates at the upper and lower landings where the steps transition into the fixed floor. Their design allows the steps to pass through the landing area while helping reduce the risk of objects becoming trapped.

Emergency stop buttons: These allow a person to stop the escalator in an emergency. Their locations vary, so it is useful to know where they are when using unfamiliar equipment.

Handrails: Moving handrails provide support and help passengers maintain balance while riding.

Safety monitoring systems: Depending on the model, sensors and switches can detect certain mechanical faults or abnormal conditions and initiate a stop.

Warning markings: Yellow markings on steps or near the edges can help passengers identify important boundaries.

Manufacturers such as Otis describe a range of protective features intended to reduce risks involving entrapment, unexpected movement, and mechanical failure. Not every escalator has exactly the same configuration.

These systems work together, but none eliminates the need for passengers to remain attentive.

Simple Rules for a Safer Escalator Ride
You do not need specialist knowledge to use an escalator responsibly.
A few straightforward habits can help make the experience safer for you and those around you.

Stand with your feet away from the side panels.

Hold the handrail when appropriate.

Keep shoelaces tied and loose clothing under control.

Keep bags and other belongings away from the edges.

Do not touch the side brushes or attempt to clean your shoes with them.

Supervise children closely.

Step on and off carefully, paying attention to the moving steps.

Avoid running, playing, or becoming distracted while riding.

Use an elevator when an escalator is unsuitable for your mobility needs or the equipment you are transporting.

If an object becomes trapped, do not attempt to pull it free while the escalator is moving. Alert staff and use the emergency stop if necessary and safe to do so.

Never enter the machinery area or attempt to repair the escalator yourself.

The Small Detail That Reveals the Power of Good Design
The next time you walk through a shopping mall or train station, take a moment to notice the escalator brushes.
They may look insignificant, but they reveal something important about how everyday equipment is designed.

Safety does not always depend on dramatic inventions or complicated technology. Sometimes, it comes from a small feature that encourages people to make a safer choice.

The brushes do not shout instructions or demand attention. They simply provide a gentle physical reminder to stay away from the edges.

They also demonstrate why familiar objects deserve a second look.

We often move through our surroundings without questioning how things work. Yet many ordinary objects contain carefully considered design choices that make daily life easier or safer.

Understanding those details can change how we see the world.

Final Thoughts: Those Brushes Are There for a Reason
Escalators are convenient, efficient, and familiar, which makes it easy to overlook the engineering behind them.

But the brushes along their sides are not decorative accessories or built-in shoe cleaners.

They are primarily a safety feature intended to discourage passengers from getting too close to the gap between moving steps and stationary side panels.

They cannot prevent every accident, and they should never be treated as a substitute for careful behavior. However, they contribute to a broader system of design measures intended to make escalator journeys safer.

So the next time you ride one, remember three simple things: stand away from the edges, keep loose items under control, and never use the brushes to clean your shoes.

A tiny row of bristles might not seem particularly impressive, but understanding its purpose is a reminder that even the smallest details can make a meaningful difference.

Sometimes, the most interesting discoveries are hiding in plain sight.