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If I’m working on a drone in my yard, surrounded by buildings, the noise has a direct line to a few people. If I put that drone at 200 feet, suddenly many more people are directly exposed to that noise. Imagine how loud a UPS truck would be within a 90° cone above your bedroom. Also, consider how many more people would be affected by that noise per delivery.

But to be fair, the frequencies are quite different.




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