How deep and high should a step be?

In public spaces a step is a well-studied aid to change levels. Only if you encounter a step made without any thought or reference to the standards do you realise how uncomfortable life would be each time you needed to hop up or down a level. In the UK a step is described as part of the “The building Regulations” and the term used for compliance with disability law as being DDA (Disability Discrimination Act 1995)

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