Hmm. Touch UI’s are terrible IMHO — you have to look away from the road to make even simple use of them. My previous car had function buttons under the radio so I could drive it by feeling where they were (once I knew the menu layout). My new car has a touch screen radio, so I *have* to look away from the road, even for trivial things like changing the sound source.
Maybe that’ll not matter once the car is driving itself though :)