And since UVA exposure adds up over time, all that driving you do over the decades creates a slow but steady accumulation of sun damage. If you live in one of those weird countries that drives on the right side of the road, then the opposite effect is seen. But at least then, in a continuation of the opposites theme, your country likely has a robust national healthcare system to help you address the problem.
This doesn't mean that you need to bundle up in a ski jacket whenever you drive to the grocery store, but if you're the sort of person who's behind the wheel a lot (long-haul truckers, road trippers, people driving to Alaska in an effort to escape the various factions vying for control of their soothsaying powers, etc.), it is recommended that you take a few basic precautions. Sunscreen is the obvious solution, seasonally appropriate protective clothing helps too, and if you're perpetually on the road because you're a traveling encyclopedia salesman, then you can apply a film or tint to your window (if legal where you live; please do not cite advice you received on Cracked if you are arrested for suspicion of being a roving sex offender). What's important to remember is that the sun is perpetually trying to kill you, even when you think you're safe.