it does not pick up other riders. In the middle of a paceline, riders behind me can reduce the distance before it detects cars/trucks. Not a problem in the echelon formation we normally ride on the windy Wed night rides.
In a longer paceline (weekend group ride), when I’m not in the back and detection distance is reduced then 95% of the time someone behind me is shouting “car back.”
Majority of my outside riding is solo - I train by myself using TR plan. At best I average one group ride a week. Looking at my calendar for short power build, I want to do the two technical vo2max intervals on the trainer, a couple outdoor solo rides, and my other hard ride is the race simulation workout (Sat ride on TR plan) which is the Wed ride / C race.
On the 120 min Wed ride, I’m solo for ~80 mins of the 120 min (at current fitness) due to 40 min ride to the start and return home, plus getting dropped because I ride with much stronger riders.
So the radar works really well in nearly all of my outside riding.