Originally Posted by
WhyFi
Hmmmm... looking at the Garmin FAQs, it seems as if this isn't a selectable light mode so much as an automatic light mode (on both the 510 and 515) when it's detecting movement consistent with being paced by trailing traffic -
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Interesting I wasn't aware this existed in the 510. However, the way I read it for the 510, it's not a light mode, just a radar tracking mode. ie. I couldn't find any mention that there's any change to the light intensity or flashing behavior, only that a following bicyclist is able to be tracked, without the threat level color bars being lit up until a fast approaching vehicle shows up.