The brain has different systems for giving attention to different types of stimulus, and a master executive to integrate them. As long as the executive isn’t over stressed, you can share attention across multiple systems, but you can’t do it within the same system. That’s why you can listen to the radio whilst driving — the auditory system is separate to the visuo-spatial system. One of the problems of using a mobile phone is that, intriguingly, when you talk on a phone, you use your visual system to literally picture what is being spoken about as well as the audio system to listen. That overtaxes the v-s attention system, and distracts from looking at the road. Indeed, even for a few minutes after the call, the system is still paying visual attention to what has just been discussed.
Given all this well-established information, it’s an extraordinary folly to require visual attention to a screen to adjust settings in the car. It’s literally not possible to drive whilst paying due care and attention and also change things on a screen. Physical knobs at least partially use a different sensory system and are much safer. Even then, though, there should be a limited number of them