Do you know ..
Walkway widths for persons on crutches

Although persons who use walking aids are able to manoeuvre through door openings of 900 mm clear width, a wider passageway or walkway is generally needed for a comfortable gait.

What is Universal Design?

Universal Design is the design of products and environment to be usable by all people, to the greatest extent possible, without the need for adaptation or specialized design. ”
Ronald Mace1
In its broadest term, Universal Design (UD) refers to "design for everyone". For the Built Environment, it focuses on creating an inclusive society, where the young, the elderly, and persons with limited mobility can continue to enjoy living in familiar surroundings with their families and friends.

1Preiser, Wolfgang F E [2001], Universal Design Handbook, McGraw-Hill, New York"