Highbeams: Because the F'ers continuously refuse to turn back on immediately after a car has passed me on a dark country road at 45 mph. I like to see the deer before they jump into my path, not just when they're standing in the middle of the road in front of me. They also refuse to work in twilight, waiting until full-dark to engage, and also turn themselves off at every stop or turn, no matter how dark and desolate.
Collision: It routinely slams on the brakes when I'm in no danger of hitting anything or anyone. Such as, when a car is stopped on the road ahead of me, waiting to make a left turn, and I plan to pass them on the right shoulder. Or, when approaching a stop light where the traffic dead-ahead is waiting in a left-turn lane, and through traffic is directed to the right around them. Or when going around one particular local bend, where forward collision repeatedly confuses an oncoming vehicle as a forward collision, if the timing between the two around the bend is just right. I find it works well enough in my truck, where I may be keeping greater distances or moving slower, but it routinely fails in my sports sedan, so I keep it off most of the time.
