Mandatory safety signs - Sometimes an instruction must be clearly communicated and, if that is the case, our mandatory signs will certainly help. These signs help workers, customers and members of the public understand immediately what action is needed to communicate messages using simple verbal commands and easily recognizable pictograms using a white safety symbol on a blue bacground. fire action signs, ear, eye and hand protection signs, hygiene and catering safety signs, escape route and access signs. If you require a custom bespoke mandatory sign head over to our Custom design your own mandatory signs section.