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Truck reversing sound
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Alex Eisenhut:
So we all know big trucks and construction equipment beeps when backing up to warn that you will mushed into paste if the truck driver doesn't see you back there.

Recently I heard something new: a kind of white noise screeching when a truck was backing up near my home. It wasn't a construction site or that big of a truck either.

But I did notice that the sound while lower in volume than the beep was much easier and quicker for me to identify. I wonder if they changed from a tone to a noise because it is easier to pick out as well as being quieter?

Seems to me that the pure tone of the usual beeping is sometimes hard to locate in areas where there are lots of echoes. Or am I dreaming this?
AndyC_772:
It's well known that white noise, which contains a broad spectrum of frequencies, is much easier to locate than a pure tone. You're not dreaming!
Alex Eisenhut:

--- Quote from: AndyC_772 on August 13, 2020, 03:06:52 pm ---It's well known that white noise, which contains a broad spectrum of frequencies, is much easier to locate than a pure tone. You're not dreaming!

--- End quote ---

Yeah, I thought so too. Do you have some sort of reference or like maybe a safety organization that publishes something that states this?

My googling is usually strong, but not for this. I get up a lot of blind alleys.
Bud:
Gosh, i wish the police and fire would use it too  >:(  and not only when backing up
Alex Eisenhut:

--- Quote from: Bud on August 13, 2020, 04:30:34 pm ---Gosh, i wish the police and fire would use it too  >:(  and not only when backing up

--- End quote ---

In Montreal we have variable volume sirens on fire trucks. They are quieter at night, but still use that single tone.  I guess at this point it is so ingrained it would require serious effort to change everyone from a tone howler to a noise screecher.
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