Depends on the vehicle, location and size of the screen, and how well the company engineered the user interface. Some engineer certain functions to be redundant where they can be done by touch screen, manual buttons and dials, and/or even steering wheel controls and some even by voice command if you take the time to learn how to use the voice command function - many do not. My Ram pickup has all of that functionality. I admit I almost never use the voice commands, but I commonly use the steering wheel controls to change radio volume or change stations, but I can also do that by turning the volume knob or through the touch screen. I can't control my climate control features from the steering wheel but I can with manual buttons or through the touch screen. On top of all of that, my touch screen is over 8" in size and is at the very top center where I don't have to completely look away from the road to see it. Sitting up high, as I do in a 4x4 pickup, I am amazed at how many people I pass on the road that have a cell phone in their hands, obviously texting or even emailing or probably even looking at facebook. I don't think the touch screen features on newer vehicles are anywhere near as big a problem. You would think this is isolated to younger people that were born with smartphones in their hands, but I see just as many "grownups" that should certainly know better. It's that human nature thing that makes people feel like those things will never happen to them.
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