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most emergency stuff such as signs and labels used to be red the RED CROSS organisation has a a patent on the red cross, and several years ago won a court battle to stop others from using the red cross when this happened emergency signs etc like a red cross on a first aid kit,and fire escape or emergency exit signs were changed to green to comply with the law after the red cross association won their lawsuit

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15y ago
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11y ago

Not all fire exit signs are red or green, but they must use high-contrast lettering and backgrounds. Under the UL standard for internally illuminated exit signs, they must be either red or green, each of which provides high contrast to a white background, or when used as white letters on a red or green background.

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11y ago

They may be green or they may be red, or any other "distinctive color", depending upon the locally enforced standards, and based upon international agreements. Internally illuminated exit signs, under UL 924, must be red or green.

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13y ago

Safety signs are green because green has been adopted as a color indicating safety. This may derive from the fact that traffic lights use green to indicate that is it "safe" to drive through an intersection.

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Q: Why are safety signs green?
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