By Shawn Henry 
Tennessee law enforcement agencies are encouraging drivers to download a smartphone application designed to reduce crashes and improve response times by alerting motorists when emergency vehicles are nearby.
The app, called Digital Siren, connects directly to compatible police cars, fire trucks, and ambulances equipped with specialized hardware. When an emergency vehicle activates its siren, the system automatically sends a notification to drivers within a defined radius, warning them to slow down, move over, and clear the roadway.
Officials say the technology addresses a common safety issue on modern roads. Many drivers do not hear sirens until emergency vehicles are dangerously close, often because of soundproofed cabins, loud music, or general inattention. By delivering visual alerts directly to a phone, the system gives drivers additional time to react safely.
The alerts are not limited to emergency response vehicles. In supported areas, police can also issue notifications related to impaired driving suspects, missing children, severe weather, and road closures. Control of these alerts remains with law enforcement agencies.
The system is especially useful during vehicle pursuits, when police often follow at a distance. Drivers ahead of a fleeing suspect may be unaware of the situation unfolding behind them, increasing the risk of collisions. Advance warnings allow motorists to pull over and reduce the chance of secondary crashes.
Digital Siren is available at no cost for both Android and iPhone users. Once installed, the app requires minimal setup and runs passively in the background. It activates automatically when a driver enters an area where the technology is supported. The app also includes a map showing active incidents and a built-in option to call 911. iPhone users need a device running at least iOS 13.4.
Tennessee police say similar alerts will also be integrated into navigation platforms such as Google Maps and Waze, though the dedicated app provides the most direct access to official notifications. Waze already supports emergency vehicle alerts through existing integrations, while also allowing users to report hazards like flooding, accidents, and road closures. Google Maps offers more limited hazard reporting options.
Although the Digital Siren platform has existed for several years, adoption has been gradual due to the cost of installing the required vehicle hardware. The system operates automatically across jurisdictions, meaning drivers do not need to restart the app when crossing state lines.
Law enforcement officials say the technology benefits both motorists and first responders by improving awareness, reducing delays, and making roads safer for everyone.
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