Here is a device designed to let bike riders know when there is traffic behind you, so they can take action accordingly. The Varia Rearview Bike Radar alerts the cyclists and the approaching vehicles using a radar tail light transmitter and a radar display unit. It detects approaching vehicles from up to 140 meters and increases brightness as cars approach.
More gadgets like this ➡️ : here
The above video shows the device in action. You can find out more on Garmin.com.
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