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Interior Design Elements

Guidance Tactile Walking Surface Indicators

A drawing of guidance TWSIs showing dimensions (described in text).

Guidance TWSIs should consist of a pattern of parallel, flat-topped, elongated bars that extend in the direction of travel.

Guidance TWSIs are appropriate at the following locations:

An asphalt pathway with light-coloured pre-cast concrete guidance TWSIs inset into the surface.

Follow these specifications for guidance TWSIs:

A table showing the spacing between the flat-topped bars, based on the top width of the bars.
Top width of flat-topped bars (mm) Spacing between the centre of adjacent bars (mm)
17 57 to 78
20 60 to 80
25 65 to 83
30 70 to 85
A drawing of a TWSI installation incorporating both guidance and attention TWSIs. Guidance TWSIs provide information to locate a reception desk, stair and elevator. Attention TWSIs are used at changes in direction along the guidance path, as well as at the top of the stairs.

An alternate type of guidance TWSI should be used on road surfaces to assist persons with blindness to navigate complex road crossings including, but not limited to crossing at:

It is important that the guidance TWSIs used on road surfaces are clearly different and distinguishable from the guidance surfaces used in pedestrian areas. Guidance TWSIs on road surfaces at pedestrian crossings should: