http://whoknew.news.yahoo.com/?nc&vid=25570923
"Ready to rumble? Police cars are deploying new sirens with heavy bass that you can actually feel coming even if you can't hear them, helping cops respond to the 240 million emergency calls every year."
Actually, this has been going on in San Francisco for quite a while. And the bass is meant to augment the siren, making you pay more attention.
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