I get phantom forward collision warnings on my car quite often, a 2015 VW Jetta TDI SEL. There are a few places where it triggers ~1/3 of the time while driving on a clean road with no other cars around in either direction.
The system doesn't trigger breaking just a warning alarm beep and dash screen warning message, but all these systems are unreliable at this point, even the newer ones have these same false positives and false negatives.
It does make sense to err a bit on the side of caution for warnings. With warnings, a false positive is better than a false negative. It’s better to occasionally annoy the driver (within reason) than fail to warn for an accident.
This isn’t the case with braking. You want to have a high degree of confidence in that scenario because you don’t want to cause an accident. It’s better to react later to an impending collision than it is to cause an accident that would have never happened.
The system doesn't trigger breaking just a warning alarm beep and dash screen warning message, but all these systems are unreliable at this point, even the newer ones have these same false positives and false negatives.