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So what would you propose as an alternative? Trucks beep when they reverse because people were literally run over by trucks. Smoke detectors beep when backup batteries are low because people died in fires.

I can sympathize with people who hate those noises, but I think the only practical solutions are for them to wear earplugs or move somewhere with lower population density.

>>nradov+(OP)
I'm sure there are plenty of possible design solutions that don't annoy others so much.

For ex: rear back-up cameras on trucks, phones that only vibrate when they're in a dark pocket, smoke detectors that fall back on noise alarms only if you don't respond to a flashing light or email reminder, etc.

>>nradov+(OP)
There are "white noise" back up sounds that are used when the trucks are expected to be used at night.

>>drjaso+j9
Fascinating, here's a good demo video: https://youtu.be/psWBaxtK19g?t=1m11s