And if you don't own a smartphone, or don't understand how to use one properly? A siren is a cheap simple solution that crosses income divisions and is easily understood by everyone.
If you don't own a smartphone or don't understand how to use one in 2017 you have other problems.
There are blind people, elderly people, and children out there, too. Looks like you are the one who has problems imaging what other people may be like.
Aloe see previous posts - not everyone can access their phones 24/7 due to many circumstances.
(nudge, nudge) "Hey Grandma, we've got to evacuate." A blind person isn't going to know what to do when they hear a siren, either. In fact nobody will, it conveys no information besides "unspecified emergency" by means of inciting panic.
Self-centered much?
Go live somewhere in tornado alley and then tell us how nobody knows what the siren means.
You don't evacuate from a tornado. You take cover. I'm sure that group of people you labeled know how to take cover. It's no different than living or working close to a chemical plant. The siren would go off at noon every day.
And analytics systems could provide a morning message to people, "tornadoes likely today in this part of the state" versus "it's too late, go hide."
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