There's been this weird, raspy artificial sound I'd hear every now and then during the daytime that I've been wondering what the fuck it is for months now. Today I finally found out the source: Amazon's delivery vans use that sound when backing up instead of the beeps that literally everybody else in the US uses. Like seriously, WTF Amazon?
Here's a link to the sound:
https://www.youtube.com/watch?v=0_3jEla_ANs
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