From time to time a walker has to drive. To move from point A to point B when points A and B are hundreds of miles apart. To tote groceries or kids or large stringed instruments. To accommodate those who seldom stroll.
Walk enough, though, and it colors the drive, makes it less efficient. At a certain point the car becomes the body with wheels for legs.
That's when a drive becomes a meditative amble. A time to think, daydream and while away the hours.