The Varia light system consists of a few different components: The Rearview Radar, Smart Bike Lights, and a corresponding wireless remote. As a connected system it will allow your bike to turn into an actively visible vehicle.
In using the system while commuting, I've noticed that it is most useful when entering traffic for lefthand turns and when exiting the bike lane to avoid debris on the shoulder. I don't rely on the radar feature 100% when entering traffic but use it as a guide so I don't have to take my eyes off the road. Once it indicates a clear road I'll double check over my shoulder and make my move. I especially like using the signals and radar whenever I have to exit the bike lane.
While using the system on training rides, I've found that the turn signals don't play as big a role as the radar particularly in more rural/open areas. When I'm deep into an interval workout or on a long training ride I can sometimes get lost in my own head. The radar can help to give you an alert for an approaching vehicle.
There is also functionality with the turn signals when a Garmin head unit is not present. I find this is potentially most effective for ebike riders who would like the visibility of an active light system but don't want or need a dedicated head unit.
-Warns of vehicles approaching from behind up to 140meters!
-Tracks multiple objects behind the rider
-Can operate independently with a Varia head unit
-(Radar Only $199)
-Adjusts to changing light conditions as well as bike speed when paired with an Edge 1000/Varia Remote
-Varia Remote will also control pattern, intensity, and beam focus
-(Headlight Only $199)
-With two tail lights you can use them as turn indicators
-Varia Remote controls turn signals when paired with 2 tail lights(Garmin head unit not necessary)
-Has a brake light function using an accelerometer when coming to a stop
-(Taillight Only $69)