Maybe its Blind spot detection then? The only option my 5'er doesn't have is HUD and I just know when I'm moving the cars around the driveway, the 3'er (with the V1) always says there is cop right behind if the 5'er is running.
I've also had false pops on the freeway when I see a new 7'series or one of those Audi's in my proximity. Can be a bit nerve-racking to keep scanning the field trying to see the unmarked only to realize its a false positive.
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