Science
What fire hydrant cap colors tell firefighters
HERE’S THE INTERESTING PART
That vibrant street decor actually serves as a highly coded municipal cheat sheet. The specific cap colors on hydrants are rigorously standardized to tell approaching emergency crews exactly how many gallons per minute they can extract from that specific pipe. Red means a weak flow, while light blue indicates a massive underground torrent, ensuring crews don't hook up a heavy hose to a pitiful trickle.
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