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The very edge of a step is known as the nosing.

It is important that the nosing is clearly identified using good colour contrast, this allows you to accurately judge where the step ends.

Ideally the nosing should be square. A curved nosing makes it more difficult to judge where the very edge of the step is. If a pedestrian's foot pivots on a curved nosing, which is more likely on a step with a small going, they are more likely to slip.

If the nosing is not well defined or is curved the likelihood of an accident is increased.
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