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A 'Danger' sign from the 1914 Universal Safety Standards. One of the earliest attempts to standardize safety signage in the United States was the 1914 Universal Safety Standards. [1] The signs were fairly simple in nature, consisting of an illuminated board with "DANGER" in white letters on a red field. [1]
The sign is commonly referred to as a radioactivity warning sign, but it is actually a warning sign of ionizing radiation. Ionizing radiation is a much broader category than radioactivity alone, as many non-radioactive sources also emit potentially dangerous levels of ionizing radiation.
Safety signs should only be used, if other measures of avoiding hazards failed. [3] [5] Also, if there is no risk, no safety signage should be used. [7] Employees should regularly be instructed about the meaning of safety signs and signals. [9] [10] Employers are obligated to maintain the safety signage. [10]
These signs are often temporary in nature and used to indicate road work (construction), poor roads, or temporary conditions ahead on the road including flagmen, uneven pavement, etc. (Note that some "high water" signs are posted to alert drivers of a flood-prone area and do not actually mean that there is a flooded section of road ahead.)
Coronavirus cases are rising again as Americans plan to celebrate Labor Day and children head back to school. Here are the precautions Dr. Leana Wen recommends you take.
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