A “trucker tan” is sometimes worn by workers in this industry as a badge of honor of sorts. It serves as a visual reminder of the freedom we get, where the scenery changes out of our “office window” on a daily basis. With the sun shining in through our driver side window a great majority of the time and tinting laws being strict for our commercial vehicles, we have excessive UV exposure to our left arms here in the U.S. (right side in some foreign countries) that causes a noticeably different shade of skin than the rest of our bodies. The effects other than just a “trucker tan” can be very dangerous and should not be overlooked!
There are actually worse things out there being caused by UV damage than a two-tone tan line. I uncovered an article on the CBS News website regarding a condition called unilateral dermatoheliosis. Check out the article at http://www.cbsnews.com/news/trucker-accumulates-skin-damage-on-left-side-of-his-face-after-28-years-on-the-road/. Due to exposure to the harmful effects of the sun for over 28 years as a trucker, the mans face had actually become UV damaged on only one side, the sun facing side where the sun’s rays would come through his driver-side window (Photo from New England Journal of Medicine via cbsnews.com). The Journal of the American Academy of Dermatology stated in an article published in 2010 that out of a given sample of melanoma cases, nearly ¾ of the cases were on the left side of the body. This speaks volumes for not only professional drivers needing to take precautions against UV, but even people who drive their automobiles as well.
On the roads I travel, I often see truckers out there trying to reduce this exposure by covering their left arm with a towel or even an extra T-shirt. I have just made a step in this direction myself, with my decision to purchase a driving sleeve that slips on and off to prevent harmful exposure. Even though it may take a while for me to get used to having this on, it seems to be a great method to prevent harmful UV rays from sucking the life out of my skin. They can even be quite fashionable, as 
some are designed to look like full-sleeve tattoos, or even camo! Another highly effective prevention method should be to use a good sunscreen! Remember during these upcoming colder months as well, not to be fooled into thinking no harm is being done just because you don’t feel the burning sensation on your skin. The UV rays are still doing damage, whether you can physically feel it or not! Be proactive in protecting your skin because prevention is much easier than trying to reverse the effects.