In 2012 a Brazilian construction worker had a 6 foot long iron bar removed from his head after the bar fell 5 floors and pierced his hardhat and skull. theguardian.com/world/201…
Hard hats are sometimes color-coded to a person’s role in a construction site. en.wikipedia.org/wiki/Har…
Today I learned of a color-coded scheme to decode street markings on US' urban streets made by utility workers smithsonianmag.com/arts-c…

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