08/23/2010 05:12 am ET | Updated May 25, 2011

St. Anthony's Hospital To Switch To Vibrating Sirens So Drivers Can Hear Over Cell Phones, iPods

DENVER -- St. Anthony's Hospital has new sirens on two ambulances that will vibrate drivers.

Rumbler sirens have a low frequency or tone that send vibrations up to 70 yards away to alert drivers that an ambulance is coming.

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