>My math teacher would say that only Napoleon was capable of doing three things at the same time (*); the rest of us should better do no more than two.

One of my favorite quotations:

Civilization advances by extending the number of important operations which we can perform without thinking about them.
Alfred North Whitehead, Introduction to Mathematics (1911)

Much of driving fits into this, but as you point out, not all of it and not all the time.


Tamar