Cars are covered with stickers. The stickers profess the driver's compensated allegiance to car parts, soda, car parts, breakfast cereal, car parts, detergent, car parts and other assorted products, most having to do with car parts. Other stickers, however, are fill-ins for actual car parts -- headlights and brake lights, for example. There are no working headlights or brake lights because they would shatter and become road hazards during even routine bumping. But don't feel bad if you've never noticed that cars have fake lights; the stickers are so realistic that even from a few feet away, you would have to touch them to know that for certain.
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In some forms of GT racing in the US, multiple classes run together in the same race. The yellow headlights allow drivers to see whether a car behind them is in the same class as they are. Because the yellow headlights are usually in the slower class, it's usually a matter of a driver in the slower class seeing WHITE headlights in his mirrors and being able to tell the car behind him is in a faster class. In short, it's a way for drivers to tell whether or not the car in their mirrors is one they're actually racing for position with.
In Nascar, people refer to brand new Goodyear tires as sticker tires. Nascar teams keep the data sticker, which holds important information pertaining to the tire, on those new tires so they can try to keep the numbers in sequence for a better match.
Because they are "stock cars" and NASCAR wants their race cars to look something like what you buy at the dealer.
Racing at night, you need to be able to see far enough ahead to react, or slow down, the better the lights the faster you can drive safely