Warning Tactile Ground Surface Indicators (TGSIs) are intended only to be used for specific hazard identification in those areas identified within D4D9. This includes:

• at the top and bottom of stairways, escalators and ramps except those only leading to areas exempted under D4D5; and
• where there is an overhead obstruction less than 2 m above the floor along the pathway, in the absence of a suitable barrier that would prevent a person from hitting the overhead obstruction.

D4D9(3) permits raised dome buttons on handrails as an alternative in some aged care buildings. The reason for the alternatives in aged care buildings is that ground surface indicators may hinder people using walking frames or the like.

Note that TGSIs are not required on enclosed landings between flights of stairs where no other entrance/exit leads onto/off the landing.

The specifications for TGSIs are contained in sections 1 and 2 of AS/NZS 1428.4.1.