Following requirements with respect to warning signals near barriers shall be complied with:
a) Audible warning signals shall be accompanied by simultaneous visual signals for the benefit of those with hearing disabilities.
b) Visual signals shall be accompanied by simultaneous audible signals for the benefit of the blind and visually impaired people. To assist blind people, lettering and symbols on signs should be raised for tactile reading.
c) Information based on colour codes only should be avoided; colour blind people may find them difficult to understand.
d) Signs should be designed, located and illuminated as per B-24.