It appears that the Vivoactive 3 vibrates when the radar decects traffic, but only if the Garmin provided "Bike" app is active. Is there a way to activate the radar alert without having to start this app. Are there any other Garmin or third party cycling apps the use the radar.
A request to Garmin: Lengthen the vibrating signal for the Varia. It's too short. A longer signal would be much more noticable on the road, particularly a rough road.