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Slip Risk in Transport Hubs: Stations, Airports and Interchanges
Transport hub slip risk is the likelihood of someone slipping on the floors of a station, airport or interchange, driven by wet weather, constant footfall and floor condition rather than by how many incidents have been logged. A hub can go a long time without a recorded incident and still carry significant, unmeasured risk. The only reliable way to know where it sits is to measure the grip of the floor, not to count what has already gone wrong.
A quiet incident log feels like good news. It isn’t proof.
If you manage facilities in a station, airport or interchange, you work in one of the hardest environments in the country for floors. Thousands of people cross them every hour. Rain arrives on the soles of every passenger. Cleaning has to happen around a service that never really stops. When someone asks how the floors are doing, “we haven’t had any serious slips” feels like a reasonable and reassuring answer.
That is the belief this guide challenges. No incidents does not mean no problem. Most slips go unreported, and near misses are the real warning sign. In a busy hub, a passenger who slips, catches themselves and carries on to their train will never appear in your data. This article shows where transport hub slip risk really sits, uses the CHIMES framework to assess it, and sets out how to move from a quiet log to measured evidence.
What makes transport hub slip risk different?
Transport hubs combine several risk drivers that rarely appear together in other buildings. Footfall is high and continuous. Weather is brought in constantly, in volume. Passengers are often hurrying, carrying luggage, or looking at departure boards rather than at the floor. Many people are unfamiliar with the building.
Hubs are also physically complex. They often have a mix of flooring types, long concourses, stairs, ramps, lifts, escalators and transitions between indoor and outdoor areas. A single site can contain very different slip risks within a few metres of each other.
This is why a general sense that “the floors are fine” is rarely enough. The risk is not spread evenly. It concentrates in specific zones, and it changes with the weather, the time of day and the season.
Why does “no incidents” give a false sense of safety in a hub?
An incident log records only what has already gone wrong, and only when someone reports it. In a hub, that is a small slice of reality. Passengers move on quickly. Many will not report a slip that did not cause an injury. Some will not know who to tell.
Treating a clean log as proof of a safe floor is like judging a car’s brakes by the fact you have not crashed yet. By the time an incident does appear, the grip problem underneath has usually been there for a long time. It may also exist at other sites in your portfolio, even if nothing has been reported there.
This matters for another reason. Grip is invisible. A concourse can look clean, dry and well maintained and still have poor slip resistance, particularly where years of footfall have worn the surface smooth. You cannot see that by walking across it.
Where does slip risk concentrate in stations, airports and interchanges?
The CHIMES framework gives you a structured way to look at what drives slip risk in a hub, rather than guessing. It covers six factors:
- Contamination: rainwater, melted snow, spilled drinks, food residue and cleaning residue, particularly near entrances, retail units and food outlets
- Heel: the footwear passengers wear, which is outside your control, and the footwear staff wear, which may not be
- Individual: who is exposed, from commuters who know the building to unfamiliar travellers carrying luggage, plus staff who spend whole shifts on the same floors
- Maintenance: the cleaning methods, products and timings in use, and whether they help or quietly reduce grip
- Environment: weather ingress, lighting, gradients, ramps, steps and transitions between wet and dry zones
- Surface: the floor material itself and its measured slip resistance
In most hubs, three areas deserve early attention: entrances, where outdoor weather meets indoor flooring; areas around food and drink outlets; and transitions between surfaces, such as the move from a stone concourse to a ramp or from a platform to a stairwell.
Why doesn’t entrance matting solve the problem on its own?
Matting is the first answer most hubs reach for, and it has a role. But matting is designed to dry feet and remove contamination before people step onto the main floor. It only works when it is large enough, made of effective material and well maintained.
In our work, we have seen major stations with three metres of entrance matting where the floor was still wet well beyond the end of it on a rainy day. If three metres is not always enough at a busy hub, a single short mat at a smaller interchange entrance is unlikely to be.
Matting, like signage, manages the symptom. It does not tell you how much grip the floor has when someone walks across it, and it does nothing for the floor beyond its edges. A hub that relies on matting and wet floor signs alone is relying on assumption rather than evidence.
How do you know whether a hub has a grip problem?
The only reliable way is to measure it. Slip resistance is assessed using pendulum testing, the method used by the HSE and relied on in UK slip litigation. It swings a rubber slider across the floor to mimic a heel strike and produces a Pendulum Test Value (PTV).
A PTV of 36 or above is generally regarded as low slip potential. Below that, risk rises as the number falls. Testing should be done wet as well as dry, because most floors behave very differently under each condition, and wet is the condition that matters most in a hub on a rainy day.
A single reading is a snapshot. Floors change through wear, cleaning and footfall, so a result from fit-out says little about how the same concourse performs today. Good practice means testing the right zones, recording dated results and repeating the tests over time.
How do you prioritise across a large, complex estate?
You do not need to treat every square metre of a hub as high risk. A useful way to think about it is by speed limits. Most of a building is a 70 mile an hour zone: dry, low-risk floor where the basics are enough. Some areas are 20 mile an hour zones, where the floor is likely to get wet or contaminated and a higher standard of control is needed.
In a hub, the 20 mile an hour zones are usually entrances, areas near food outlets, toilets, wet-weather routes from platforms or taxi ranks, and transitions between surface types. Focus measurement and improvement there first. A quiet, dry corridor deep inside the building rarely needs the same attention.
This zonal approach also stops effort being spread thinly across the whole site. It lets you put time and budget where the real exposure is.
What does fixing it involve?
Once measurement shows where a zone falls short, the Slipology Method gives a clear sequence. Assess the real risk with pendulum testing. Amend the floor and the conditions at source, which might be a treatment, a change to cleaning products or methods, or a review of matting. Advocate for the right standards with contractors and site teams so they hold day to day. Assure the improvement through regular checks and the right cleaning approach. Affirm the result with dated data.
Slip Safety Services has found that organisations following a measure, improve and prove approach across their sites see a 57%+ average reduction in slip incidents. The improvement comes from addressing genuine causes rather than relying on the absence of a recent incident as reassurance.
For a hub, the “Assure” stage matters especially. Surfaces wear quickly under heavy footfall, and cleaning contractors change. Without planned re-testing and treatment, grip drifts back down.
What good looks like
A Facilities Manager managing this well knows which zones across the hub are the highest risk and has recent, dated PTV readings for them, wet and dry. Entrance matting is checked for size, condition and coverage, not assumed to be working. Cleaning products and methods are reviewed against each type of flooring. Contractors work to a consistent standard across every site in the estate.
Near misses are treated as useful data rather than ignored because nobody was hurt. When someone asks how safe a particular concourse is, there is a measured answer, not a reference to how long it has been since the last reported slip.
The takeaway
An empty incident log tells you what has not been reported yet. It does not tell you whether your floors are safe. Most hubs do not have a slip problem, they have a grip problem, and a grip problem can only be found by measuring it.
Next step
If you are not sure whether confidence in your hub’s floors is backed by evidence, the Slip Prevention Scorecard takes a few minutes per site and gives you a clear picture of where you stand. For the fuller method behind measuring, improving and proving floor grip, Slipology by Christian Harris covers the process in depth.
FAQ
Why are train station floors so slippery when it rains?
Rain is carried in on shoes and clothing in large volumes, and wet footfall spreads it across entrances and concourses. If the floor has worn smooth or matting is too small to dry feet effectively, grip can drop sharply. A floor that is fine when dry can behave very differently once wet.
What is a safe slip resistance level for a station or airport floor?
A Pendulum Test Value (PTV) of 36 or above when wet is generally regarded as low slip potential, based on HSE guidance. Below that, risk increases as the number drops. The reading should be taken for the specific zone and under the specific conditions it is likely to face, wet as well as dry.
Do transport hubs need to test their floors if there have been no slip incidents?
An absence of reported incidents does not mean an absence of risk, because most slips and near misses go unreported. Testing gives you an actual measurement of grip rather than relying on an incident log. Requirements vary by circumstance, so check what applies to your operation.
Which areas of a transport hub carry the highest slip risk?
Entrances, areas near food and drink outlets, toilets and transitions between different flooring types usually carry the highest risk. These are the places most likely to be wet or contaminated, and they see heavy footfall. Quiet, dry areas typically need less frequent attention.
How often should floors in a transport hub be slip tested?
High-risk, frequently wet zones are generally tested at least annually, and again whenever cleaning products, footfall or the floor itself change. Because grip changes over time, a single result from installation does not reflect today’s performance. Regular, dated readings give the clearest picture.