DIRECTIONAL TACTILE PAVING

Directional tactiles (TGSIs) give people with visual impairments directional orientation in open spaces where there are insufficient cues such as handrails or walls. Directional tactiles designate the route to be taken to avoid a hazard. 

Some common areas which require the installation of directional tactiles include:

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• A mid-block kerb ramp or street crossing

• Public transport access point (e.g. bus, tram or light rail stop, train or light rail station or passenger ferry wharf)

• Point of entry to a significant public facility, e.g. railway station, public
  hospital, community health centre, sports or entertainment venue or
  public toilet.

Chelmstone's has been supplying its directional tactiles to major project and city councils around Australia for well over a decade. 

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DIRECTIONAL TACTILE COLOUR RANGE

A tactile's colour choice is vitally important to ensure it's in compliance with AS/NZS 1428.4.1:2009 luminance contrast requirements. Luminance contrast of TGSIs is the difference in the amount of light reflected from
the TGSIs compared to the amount of light reflected from the background or adjacent path of travel, commonly referred to as luminance reflective value (LRV). Where the TGSI is an integrated unit, it requires a minimum luminance contrast of 30% compared to the amount of light reflected from the surface of the adjacent path of travel. Each colour has its own specific wet and dry luminance value. To caculate whether two areas have a sufficient 30% contrast enter in the values into the below luminance calculator.  

Voodoo
 

Wet LRV - 4.0
Dry LRV - 8.0

Ivory

Wet LRV - 40.3
Dry LRV - 62.0

Pewter

Wet LRV - 33.4
Dry LRV - 46.8

Yellow

Wet LRV - 42.0
Dry LRV - 46.0

Corn

Wet LRV - 24.5
Dry LRV - 33.0

Snow

Wet LRV - 50.1
Dry LRV - 77.1

Red

Wet LRV - 7.7
Dry LRV - 12.0

LUMINANCE CALCULATOR

Enter your lowest wet or dry luminance reflective value (LRV) first into the luminance calculator, followed by your corresponding higher wet or dry luminance reflective value (LRV) next. 

If the luminance contrast achieved is great than 30%, the colours are suitably integrated and contrast minimums have been achieved. ​

This Calculator uses the open-source Bowman-Sapolinski Equation as stipulated in AS/NZS 1428.4.1:2009

DIRECTIONAL TACTILE SIZES 

All Chelmstone's directional tactile ground surface indicators  (TGSIs) comply with Australian standards as detailed in figure 1.2.

Chelmstone supplies directional tactiles in several sizes including the following:
 

• 300 x 300 x 40mm

• 300 x 300 x 50mm

• 300 x 300 x 60mm

• 400 x 400 x 40mm

• 400 x 400 x 80mm

• 300 x 600 x 60mm

Figiure 1.2