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Red flags fly on beaches due to dangerous rip currents and high surf. Here's how to stay out of harms way.
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Non-ionizing radiation can also reach potentially dangerous levels, but this warning sign is different from the trefoil ionizing radiation warning symbol. [11] The sign is not to be confused with the fallout shelter identification sign introduced by the Office of Civil Defense in 1961. This was originally intended to be the same as the ...
Beach Advisory Warning Sign in Orange Beach, Alabama. A beach advisory is a warning given by a local government to avoid swimming in a body of water. [1] Beach advisories do not automatically close bodies of water to swimmers but instead function as a warning to swimmers against swimming at a particular site.
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Signs explaining how to escape from a rip current, posted at Mission Beach, San Diego, California As seen from above, this shows how a rip current works. Breaking waves cross a sand bar off the shore. The pushed-in water can most easily travel back out to sea through a gap in the sand bar.
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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]