When you are in control of an 80,000 pound vehicle, you shouldn't be doing anything but driving. When you watching your rig and surrounding traffic and shifting gears and worrying about being legal and hoping you can stay on schedule you really don't have the capacity to concentrate on anything else. You get time alloted for eating and rest. When you recieve your CDL you are supposed to be a professional. Any thing you do that may be a distraction is not being professional.
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