BLOG & NEWS
How Does Footfall Affect Slip Risk in Transport Hubs?
Footfall affects slip risk in transport hubs in three main ways: it brings in more moisture and contamination, it wears floor surfaces smoother over time, and it exposes more people to any hazard that is already there. The busiest zones are therefore often the ones where grip changes fastest. A busy floor that looks clean can still have poor grip, and the only way to know is to measure it.
The short why
Footfall is a multiplier. It does not create a slip hazard by itself, but it amplifies the ones that exist. More feet carry in more water, grind the surface harder and put more people at risk when something goes wrong. In a transport hub, where footfall is heavy and continuous, those effects build up quickly.
How does footfall bring more contamination onto the floor?
Every person who walks in on a wet day brings moisture on their shoes, coats, umbrellas and luggage. At a busy station or terminal, that adds up to a large and constant volume of water, especially around entrances, arrival routes and baggage reclaim.
Heavy footfall also means more spilled drinks, food and general debris. Contamination is the first factor in the CHIMES framework, and in a hub it is rarely a one-off event. It is a steady flow, which can outpace a cleaning schedule built around occasional spills.
How does footfall change the floor itself?
Feet and wheels wear surfaces. Over months and years, the areas people walk most can become smoother than the rest of the floor. A surface that had good grip when installed can lose it gradually, without any visible change.
This is why the busiest routes, such as the line between an entrance and the platforms or gates, often deserve the most attention. The wear is concentrated where footfall is concentrated. It also means a test result from refurbishment says little about how the same route performs today.
Why doesn’t a clean-looking floor mean a safe one?
This is the belief worth challenging directly. In a busy hub, floors are often cleaned very frequently, so they usually look good. But looks clean does not mean safe. Cleaning removes dirt, not risk, and a floor that has been worn smooth stays smooth however often it is mopped.
The wrong cleaning product or method can also leave a residue that lowers grip. In a hub where cleaning happens constantly, small problems with product or method can build up across a large area. Grip is invisible, so the floor can look perfect while performing poorly.
What other footfall effects matter?
Footfall is not only about volume. The type and pattern of movement matter too. Using the CHIMES framework, a few factors stand out:
- Individual: passengers are often hurrying, tired or distracted, pulling luggage and watching departure boards rather than the floor
- Heel: footwear varies hugely across a crowd, and cannot be controlled
- Environment: crowds make it harder to see the floor, and peaks, such as rush hour and wet-weather surges, change conditions quickly
- Maintenance: heavy footfall makes it harder to clean without disruption, so work often happens when passengers are present
These effects interact. A surge of people on a wet day, on a floor that has worn smooth, with passengers hurrying, is exactly when a slip is most likely.
Does more footfall always mean more slips?
Not automatically. More footfall means more exposure, but a floor with good grip, well maintained and controlled at the points where water comes in, can handle heavy use safely. That is the real point. Footfall tells you where to look first. It does not tell you how safe a floor is.
Using speed limits as an analogy, most of a building is a 70 mile an hour zone, where the basics are enough. The busiest wet routes are 20 mile an hour zones, where a higher standard of control is needed. Footfall helps you identify those zones.
How do you manage footfall-driven risk?
Measure the grip of the high-footfall, high-moisture zones, wet as well as dry, using pendulum testing. A Pendulum Test Value (PTV) of 36 or above is generally regarded as low slip potential. Below that, risk rises as the number falls.
Then act on what the readings show: adjust cleaning products and methods, improve matting at entrances, or treat surfaces that have worn smooth. Re-test regularly, because footfall keeps changing the floor. Slip Safety Services has found that organisations who measure and then act on the result see a 57%+ average reduction in slip incidents, because the effort goes where footfall and risk actually meet.
What to do about it
Map your hub by footfall and moisture. Identify the busiest routes and the places where water comes in, and find out when each was last tested, and whether the reading was taken wet as well as dry. Where there is no recent, dated reading, treat that as the first gap to close.
Use footfall data you already hold, such as passenger numbers or peak times, to decide how often to re-test. The busier the zone, the shorter the gap between checks should be.
Next step
If you are not sure how your busiest zones are performing, the Slip Prevention Scorecard takes a few minutes and gives you a clear starting point. For the fuller method behind measuring, improving and proving floor grip, Slipology by Christian Harris covers the process in depth.
Related questions
- Why are train stations high-risk for slip accidents?
- Why do train station floors get so slippery in wet weather?
- How is slip risk managed at busy transport hubs?
- How often should you test floor slip resistance?