TGSIs provide cues, which, when combined with other environmental information, assist people who are blind or visionimpaired with their orientation. Orientation is a persons awareness of where they are, where they are
going, and where they have been. A persons orientation, through processing all available
environmental cues, will make the information provided by the TGSI meaningful. Warning TGSIs indicate an approaching hazard but not what the nature of the hazard will be. TGSIs should be installed to provide guidance and/or warning of an obstruction or hazard in any location where insufficient alternative or natural tactile cues exist.