Question

Alert symbols usually are of which colour?​

Answer 1

Answer:

Mandatory signs must be round, with a white pictogram on a blue background. The blue part must take up at least 50% of the area of the sign. Green is a safety colour and must be used for: emergency escape signs

Answer 2

Answer:

Alert symbols are usually of red colour as red colour has the highest wavelength and scatters the least. Therefore red colour, even when viewed from a large distance appears red only and helps people interpret the signs even from a large distance.