Hi Garmin Forums!
I've seen this was already requested over the internet and also here: https://forums.garmin.com/sports-fitness/cycling/f/varia-series/145830/idea-for-garmin-driveralert-mode-for-the-varia-radar-tail-light
This feature is much anticipated. I ride 10+ hours and would like to have the light ride this with me, but blinking when vehicle approaches - that's for safety. Which varia is all about.