No, you must never use the high beam headlamps in foul weather, because they produce much more upward light than the low beams. This upward light, reflects back into your eyes off rain, fog, or snow, substantially worsening your ability to see.
Also, you must never use your high beams in traffic, only ever on empty roads.
Both of these points are a matter of law in most places, but whether or not your local law spells them out, to do otherwise is to make unsafe, improper use of your lights.
yes. although it may seem dangerous to oncoming traffic, the fog would help keep the light from blinding them.
Begging to differ, high beams should never be used in foggy conditions. The extra light is just reflected by the fog making it far more difficult for you to see. Ideally for best visibility in fog you'd have fog lights designed to focus on the road directly in front of the vehicle with a very short cutoff (short range). If they were supplied with your car (usually mounted low on/in the front bumper) you'll notice they don't operate when you're using high beam.
No. Either use your regular headlights since they help other drivers see you. Also, slow down.
Full beam lights in foggy conditions will reflect the light directly back at the driver. Dipped headlights should be used instead.
Yes, when driving in foggy conditions you should use your headlights which allows oncoming drivers to see you at the earliest possible moment. However, for safety, you should not use your highbeams [bright] as the fog will reflect back much of the light, reducing your ability to see into [through] the fog.
No, you should not use high-beam headlights at all in heavy fog.
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.
You should not use your high beams in the fog. Your high beams will reflect off of the water in the air from the fog making it even harder to see.
overdrive
You don't want to use high beams in foggy weather or snow. It actually makes it more difficult for you to see as the light reflects off the snow or fog.
Fix My Headlights is a great place to go to correct foggy headlights. They are very trusted and can do a very good job. I do not know anyone who has used it but it seems good.
low beam
Not use their high beams and drive dramatically lower speeds.
Your headlights should be on whenever it will make a difference on the road. If you can look at the road and be able to tell that your headlights are on/off, then they should be on. Some states, such as New York, require headlights to be on when visibility is limited, such as in rain or fog, even in the day, regardless of whether or not you can see them on the road. In fact, one of the criteria for headlights is whether or not you are using your windshield wipers. At dusk or, in some states where mandated, when it is raining or foggy and you need to turn on your windshield wipers.