This recommended practice establishes signal words@ color combinations@ letter sizes@ and durability requirements for permanently and temporarily affixed safety signs for off-road@ self-propelled work machine categories of construction@ general purpose industrial@ forestry@ and specialized mining machinery as defined in SAE J1116 MAY79. This recommended practice is suitable for application to tools@ machines@ and machinery used in the specified categories. PURPOSE: This recommended practice establishes uniformity of safety signs to promote safety of persons associated with off-highway work machines.