Question

Why danger single lights are red in colour ?

Answer 1

Hii friend
All the danger signals r in red colour.It is because it is the least deviated colour and is more clearly visible.

hope it helps you
thank you

Answer 2

since the deviation of red light is very less it's visible to us more than any light so red light is preferred because it will attract the people more than any light and the probability to see the danger sign will be more and people will be more cautious