A Tactile Ground Surface Indicator (TGSI) is a device set into the surface of a public pathway that creates a tactile surface that can be felt underfoot or with a cane. It is designed to alert pedestrians, particularly the vision impaired to the presence of a hazard or a point of interest adjacent to a pathway such as a bus stop or a pedestrian crossing.
GAA Engineering Design and Construction Manual
The GAA Engineering Design and Construction Manual states:
Use of Tactile Ground Surface Indicators (TGSI) shall be in accordance with DDA requirements and any Council strategies for disabled access. The use of TGSI will be minimised by designing for a continuous path of travel in order to avoid their need at minor access street intersections. Changes of footpath direction at crossings are therefore discouraged.
Footpath and Pram Crossings (kerb ramps) in new subdivisions shall be provided in accordance with DDA requirements. Location and alignment shall support the principle of “continuous path of travel” requirements.
TGSI are not required where:
- The geometry of a kerb ramp at an intersection is fully compliant with AS1428.1; and
- The ramp is located on the direct extension of the property line; and
- The top of the ramp is no more than 3000mm from the intersection of property lines.
TGSI are required at all kerb ramps that do not comply with the above, at all mid block crossings, and at high usage vehicle crossovers, e.g. service stations and shopping centre car parks.
Directional TGSI are to be used where a kerb ramp is not located on the direct extension of the property line in an accessible path of travel from the building / boundary line and will lead to warning indicators installed at the crossing (kerb ramp)
Directional and warning TGSI will always be required at mid block pedestrian or school crossings, tram and bus stops.