When its foggy or a snowstorm
Full beam lights in foggy conditions will reflect the light directly back at the driver. Dipped headlights should be used instead.
low beam
Because a minority of people think that it makes their car look better, and in turn blind others.
You should cut on your car lights at dusk or any time that the law requires you to have them on. Some states require you to have car lights on whenever your windshield wipers are on for rain.
fog lights are not always yellow.... i have no answer to your ? but i can tell you as a mechanic that all fog lights are not yellow and do not need to be.... all a fog light is, is a light placed lower on your vehicle so the light is not reflected into your face when it is foggy.... look in your local laws but in California if it is foggy and your vehicle is equipped with DOT fog light you do not have to use your regular head lights in a foggy situation... you do however have to turn on your running lights
low lights
You should dim your lights as soon as you see their lights.
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As soon as the oncoming car is in sight.
low beams
Usually no, Much of the high beam will be reflected back at you by the tiny droplets of fog possibly making it harder for you to see.