State police say they will soon have an easier time communicating with motorists on the road thanks to patrol vehicle ...
A new siren system uses four speakers, and a device called a Rumbler, which creates low-frequency vibrations to help ...
White County has just announced the installation of the necessary hardware to be part of the Digital Siren network; it's the first county in Tennessee to do so ...
The Auto Wire on MSN
Police app alerts drivers to nearby emergency vehicles
Tennessee law enforcement agencies are encouraging drivers to download a smartphone application designed to reduce crashes ...
The Police Siren circuit uses two 555’s to produce an up-down wailing sound. The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage ...
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