Most floors are not perfectly safe... PTV > 40
Safe floors have a PTV of 40 or more when wet. This means that less than 1 in 1 million people will have a tendency to slip when walking on the floor even if they turn or chang direction.
Manage slip risks...

Quantifying the slip resistance will help you to manage the risks. Regularly testing floors when they are changed or polished and testing whenever there is a minor slip will help you to understand and manage slip risks. Learn how to keep your floors safe.
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"At risk" floors...
Most buildings have a few "at risk" floors. These are the floors you already you about. They are the floors where slips occasionally happen. These are the floors you need to test regularly. Some may have been treated with an anti-slip treatment but these treatments can and will eventually wear or be affected by polishing or cleaning.
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