• Tactile Ground Surface Indicators are covered by the Australian/New Zealand Standard 1428.4.1:2009 and is described as a means to assist individuals with a visual impairment.
• Hazard Tactile Ground Surface Indicator's must be installed where a potential injury risk or hazard -  for instance this includes, however is not limited to: a roadway, a stairway, escalators, railway platforms, bus stops, etc. - are located. 
• Directional TGSI's must be installed where a change of direction is located for EXAMPLE: bus stops, traffic islands, railway platforms, etc.
• TGSI's must have a MINIMUM Luminance Contrast
  reading of 30% measured against adjacent surfaces.
• Tactile Ground Surface Indicators must be 4mm - 5mm in height to allow clear identification for and by individuals with visual impairments.
• When TGSI's are installed they must be installed in a manor that spans the full width of the path of travel.
• TGSI's also require: to be detectable by tactile means; to be lain in such a way that there is no likelihood of the edges lifting; to be slip resistant 

A Tactile Ground Surface Indicator (TGSI) serves two (2) purposes.

The first purpose is to direct individuals with a vision impairment along the safest path of travel.

This known as a directional tactile.

The second purpose is to alert individuals with a vision impairment of a potential hazard that lays ahead such as a stairway or roadway.

This is known as a Hazard tactile.

For more information or installation advice please contact ASN!