Information on Detectable Warnings
The detectable warning
with a bar tile cue was a modification to the truncated dome detectable warnings
that are required at curb ramps in the United States (U.S.
The guidelines require the installation of detectable warnings
on sidewalks, street crossings and curb ramps, hazardous vehicular ways, and transit platform edges.
ADA also has raised controversy among blind people about modifying the built environment, particularly regarding raised, truncated dome detectable warnings
, ostensibly to alert blind persons approaching or walking along platform edges.
These specifications include the required used of detectable warnings
such as truncated domes, at curb ramps and hazardous vehicular areas.
Research is under way at this time to determine whether certain types of detectable warnings
are effective and if there is actually any use for them in the environment.
However, concerns associated with the safety and negotiability of such detectable warnings
for other travelers have resulted in much controversy.