For me its car's lane assistant, interfering with driving is big no for me. Asked my father to turn it off on their new mazda 3 too, 99% ok behavior is simply too low, even 99.9% would be.
Of course, I always turn these stupid features off but, inexplicably, my wife likes them and keeps turning them back on. So when I happen to drive that car it continues to be a nasty surprise until I remember to turn it off. This also makes a separate UX failure even worse. Settings like seat position, enter/exit behavior, navigation and even entertainment options are stored and recalled in per-driver settings. These per driver settings can also be linked to each key fob. She has her fob and I have mine. Very nice - except these damn driver "assist" features are NOT stored in per-driver settings like they obviously should be!
Damn it, car UX designers - all user options should be stored per driver. It's a few KB for bit flags and single-byte values, it's not like we don't have the storage these days.
Otherwise, in city driving, it's like some paranoid front seat passenger grabs the wheel every 30 seconds.