Interestingly enough, we all have limits on the amount of things that we can at one time. This uses our cognitive resources. Depending on what tasks we are trying to accomplish we can devote different amounts of our resources to these tasks.
Thank you for sharing this, RoadTime. It is a nice summary. I have always thought that multitasking is overrated and is not a goal that is worth pursuing in and of itself. It is better to focus on getting your work done than it is to try to develop the non-existent "skill" of doing multiple things at once. Brainpower is a limited resource.
If there is more work to do than you are able to do in a given moment or week or year, you will get more done and, more done well, if you prioritize, plan and focus. These are all skills that can be developed. You will get less done, and less done well, if you try to multitask. So too in recreation. If you go to a concert and focus intently on the band and the performance, it will be more meaningful and more memorable. If you multi-task and focus on the band, the crowd, the people watching, the concessions and more, it becomes a crowd experience that is little different than most others you attend.
The quality difference and skill development can be instantly demonstrated behind the wheel. Try driving for five consecutive, uninterrupted minutes with full attention on your driving. When you signal a turn, think it through. When do you initiate the signal? How do you initiate it? What are your eyes, ears, nose and mind also doing at the time? When you look at "the big picture," what are you seeing exactly? When you read a road sign, read it aloud to keep focused on your driving task. Notice how your driving improves when you are fully self-aware, fully aware of your surroundings and fully intentional in your deeds.
As you practice these skills of self-awareness, awareness of your surroundings and intentional focus, the skills grow. Your brain gets better at these things, just as you get better at throwing a ball or playing a game if you practice it.
If you attempt to multi-task by driving, talking on the phone, monitoring the CB, taking photos of interesting sights, etc., refining your political opinions as you listen to talk shows, you will find yourself missing turns, photo opportunities and more; and you may find yourself in a wreck that could have been avoided had you not been multitasking.
Multitasking does exist. Our brains do it all the time, controlling our heartbeat while we plan a trip, for example. But the notion that you will be more productive or more effective by adding complex tasks to the menu and trying to do them all at once is without merit, I believe. If you wish to develop mental skills, choose skills that can actually be developed, not one that, by definition, introduces more complexity and conflict into your life.
As a job in which mental skills can be developed, expediting is glorious. You have the freedom of a self-employed worker. After you do a few loads and a bit of driving, the work becomes mostly low-level, as described above (though there is a difference between driving in Manhattan and Nevada). With the truck serving as your home, you don't have to get someplace else to be home or to have home resources at hand. The travel presents endless opportunities to avoid a physical and mental rut, and instead appreciate new sights, sounds, smells, events and opportunities.
Expediting presents a a truly unique opportunity to develop one's mental skills while also doing interesting work that pays the bills.