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Detectable surfaces along accessible routes, corridors and paths

Textured surfaces assist in giving a secure foothold to ambulant disabled persons while detectable surfaces with a change in plane will assist the blind or partially visually impaired.

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"