Why are some Blind dots different colours?

Question

We all know about blind spots/dots especially skaters like me

that on every street there are these spots that let blind people know that there is a road nearby or stairs

but in Cork City where I am from some of them are different colours?

why is that... O.o

just so everybody knows if you say a stupid answer

trying to be funny

nobody will laugh (-_-)

Answer 1

at this point - its not related to the blind - its related to the environ and for the non-blind to appreciate its presence.  it  adds color to the cityscape!  dont u  agree