So this post may go slightly down the slamming road, but no harm intended. My driving style has never been aggressive, and I leave room between vehicles all the time. Anyway, let's just say passengers in my car never get nervous. Anyway, my wife from an early age learned to drive very aggressively. She manages it in the sense that she does not get into accidents, but let's just say I used to get into trouble for asking her to give a little room (because she made me nervous if I was a passenger).
So we bought the Clarity with these warnings. For the like first couple few weeks the car was constantly flashing warnings. I got a kick out of it, because she cannot "bark" at the inanimate object that is the car. And the best part I didn't get into any trouble with her for saying stuff like "Hey, you're getting too close..."
So roll the clock forward a year of Clarity ownership. That feature literally changed the way my wife drives. She, like me, basically never sees the warning now, and does leave more room between vehicles.
So I'm guessing there's either differences in the tuning of this feature, or different driving styles involved, or a bit of both. I'd add, the Clarity is simply not a performance car. I love it, but if your instinct or need is to drive like a bat out of hell, Clarity would rank super-low on the list-- in fact it's probably the wrong car for some folks to own. i.e. doesn't even come close to a sports car, nor does it 'handle' better than a brick. I think my 1967 plymouth fury III had better handling than the Clarity. All good with me (and not the reason to own this car).