Need a JDM lesson: What's with yellow head/fog lights?

Trips

There are two classes of race cars in the 24 hour Daytona race racing at the same time but not in competition with each other. The GT cars have yellow headlights and the Daytona prototype cars have white headlights. This way you can tell at night by the color of the headlights of the car behind you if this is a car you are competing with for position or not.

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