Old headlights may produce only 20 percent of the light created by new ones

As your car gets older, its headlights may be giving you far less visibility than you think, according to a new study. Over time, the plastic coating on headlights can become so clouded or yellowed that they give off only 20 percent of the light they had when you first bought the car, the AAA study says. That puts drivers at great risk of crashes as their car ages. The findings reinforce the idea that car owners should routinely check the coating on their headlights and, if necessary, get them restored. (See tips on how to do that below.) There are inexpensive kits...

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