kenw is exactly right about "visiting" whilst driving.
AAA had a study a few years back reporting on the top list of things resulting in distracted driving accidents:
1) Talking to passengers/kids in vehicle
2) eating
3) Climate controls
4) stereo
5) Cellular phones
Funny that only the last one has been banned so far (in some locales).
Frankly, what's going on inside the car isn't the issue, the issue is that we aren't trained as drivers, we're trained as "get there-ers"
People don't get into a car because they are driving, they are going from A to B, and as long as they feel that they will get there, that's enough. Part of my vehement dislike of automatic transmissions is because it contributes to this feeling of complacency.
If people were more interested in driving, they would simply do that. If I am in my car, I might talk to you, assuming that driving did not require 100% of my attention. As soon as that changes, I will tune you out. Same goes with stereo, phone, food, etc. Sure, crusing the highway at 5mph over with the cruise set (in the right lane) I might have a phone going. Stop & go traffic, or spirited cornering? **** no.
In my opinion, people should learn how to drive in RWD cars, no power steering, no traction control, or ABS, no automatic transmission- and they should do it in the rain.
If you can get good at doing that, most everything else will become a snap. Plus it conditions you to know what the car is doing ALL THE TIME.
One thing I did, was taught my sister the "awareness game". Essentially, your passenger will ask at any given time if you know what color the cars around you are, and where they are. It makes you much more attentive to what is going on around you, without being too distracting. ****, I even do it with myself to keep my attention focused.