Safety signs have a very specific colour coding convention, with each having their own meaning:
Green – Safe Condition. These include first aid and drinking water signs, as well as fire exit signs.
Red – Prohibition and Fire Equipment Signs. Prohibition signs should be used to show that certain actions must be avoided, such as restricted or no access, no smoking, no dogs. Fire equipment signs should be used to both shows the location of fire fighting equipment as well as alarm activation points.
Yellow – Hazard Warning Signs. Normally accompanied with the words danger, caution or warning, these signs should be used to provide a clear warning message.
Blue – Mandatory Signs. These instructional signs give clear guidance on what actions must be taken. For instance, the wearing of PPE, reporting to reception and keeping a door shut or locked.