Australian Standard 1319 specifies that these signs shall be a white symbol with a blue disc. Usually the word MUST is contained in the message.
When deciding what size of safety sign to purchase you should take into account the viewing distance.
225mm x 300mm - viewing upto 12m300m x 450mm - viewing upto 18m
450mm x 600mm - viewing upto 27m
The majority of our safety signs are following day service for pick up from our store. Express delivery can be arranged, please confirm availability & freight costs by calling (03) 9792 1380