I care when I see an arrow pointing ahead and can "read" the detector and notice if the cop is moving or standing still or as he is coming towards me, where he is....up front....or maybe coming up from the rear.
I can't tell you how many times, I've picked up a signal up ahead pulsing like he's standing still only to see nothing until I then pick up a strong signal to the side and by experience know, he's up on the on ramp that I'm about to pass by....thus saving my ass as I can actually figure out where he is vs wondering if it's a false alarm or a cop in the distance up ahead.
I also use the arrows in conjunction with multiple cops....one, two or often three cops up ahead with guys pulled over on the other side of the road only to find my V1 is telling me there's a cop shooting from up on the bridge or ramp behind me.
Weather I'm prepared at that moment or not, I'm at least the one driver who found the shooter and then knows where they are / typically wait for my next trip in that area. Others just drive by thinking they are lucky they didn't get pegged and go on still not knowing where the shooter was sitting.
Maybe you jam on your breaks and slow down at a moments notice, but I don't have to as I can pretty much tell where the shooter is at.