Why are car fog lights all white now?

[WilliamFitz]

Car fog lights are all white because white light has the highest brightness. Function of car fog lights: The purpose of rear fog lights is to make the vehicle more visible to drivers behind in conditions of low visibility such as fog, snow, rain, or dust. Precautions for using fog lights: Car fog lights can increase visibility distance, improving the visibility for the driver and other traffic participants, allowing oncoming vehicles and pedestrians to spot each other from a greater distance. Under normal circumstances, fog lights should not be used; they are only necessary in thick fog. Even in heavy rain, only low beam headlights are needed, as fog lights do not provide any additional assistance to the driver.