Originally Posted by
JohnJ80
2. The disappearing act that threats do when there is no speed differential. This can be dangerous. This is much, much more likely to happen in an urban setting where a cyclist is moving at far less of a speed differential to cars than on a highway.
I'd rate my experience with it 4 stars, holding back on the 5th because of this. While it can help with situational awareness you can't trust it 100%. It's additive to looking over your shoulder, not a substitute. This disappearing act is especially dangerous when a car closes the distance behind you but falls back to your pace or slower because it's unsafe to make a pass. In this scenario the car could be hovering 10 or 20 feet behind you, but the Garmin is showing all clear.