Riding a bike on a daily basis is great for your body but you will need to stay alert to avoid accidents. The Garmin Varia RTL515 is an app smart cycling rearview radar with tail light that helps you stay safe on the road. It combines with your phone to give your vibration and audio alerts.
The Varia radar can also integrate with apps such as Ride with GPS. It has daylight visibility up to 1 mile to keep you visible to motorists. You get an alert when vehicles are approaching from behind up to 140 meters away.[where to get it]