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ANSI Z35.1 the Specifications for Accident Prevention Signs, [c] was an American standard that dictated the layout, colors and wording of safety signs in the United States. The standard is the first American standard that made specific demands for the design, construction, and placement of safety signage in industrial environments.
Overwarning is a related problem, where warnings are overlooked by people due to the sheer number of warnings, such as placing many safety signs together, redundant or obvious warnings. [21] Effectiveness can be reduced through conditions such as poor maintenance, placing a sign too high or low, or in a way that requires excessive effort to read.
DANGER [signs] should not be used for property damage hazards unless personal injury risk appropriate to these levels is also involved." [1] OSHA 1910.145 Definition: "Shall be used in major hazard situations where an immediate hazard presents a threat of death or serious injury to employees. Danger tags shall be used only in these situations." [2]
a signal word – either Danger or Warning – where necessary; hazard statements, indicating the nature and degree of the risks posed by the product; precautionary statements, indicating how the product should be handled to minimize risks to the user (as well as to other people and the general environment)
ANSI's Z535 signal words and associated design standards are crafted to interface seamlessly with the International Organization for Standardization (ISO) - making ANSI's DANGER, WARNING, CAUTION and NOTICE standards the most widely used and accepted in the world.
On roadside warning signs, an exclamation mark is often used to draw attention to a generic warning of danger, hazards, and the unexpected. In Europe and elsewhere in the world (except North America and Australia), this type of sign is used if there are no more-specific signs to denote a particular hazard.
ISO 7010 is an International Organization for Standardization technical standard for graphical hazard symbols on hazard and safety signs, including those indicating emergency exits.
ISO 3864-1:2011 Part 1: Design principles for safety signs and safety markings [1] ISO 3864-2:2016 Part 2: Design principles for product safety labels [2] ISO 3864-3:2012 Part 3: Design principles for graphical symbols for use in safety signs [3] ISO 3864-4:2011 Part 4: Colorimetric and photometric properties of safety sign materials [4]