Encountering Mr. Fog
The real answer is you turn on Mr. Lights

Here in Sweden, all cars are required to always have their lights on when the car is moving/active, regardless of time of day or weather.

I was about to reply that sometimes it is better to not use your high beams in fog, as it is can reduce your visibility.

But then I realized that most places don’t have our laws of lights, so I wrote this commwnt instead.

In Canada we are required to have Daytime Running Lights (DRLs) which are less bright and are just on by default, but they don’t turn on the tail lights. For the most part, DRLs use the same bulbs as the high beams but at a lower wattage or something (I am not an electrician)

But yes I agree, high beams and fog don’t mix.

My DRL are LED while my main headlights and high beams are halogen
Oh weird maybe it’s different depending on the vehicle and maybe newer vehicles have separate bulbs. The car that I had where the DRLs and high beams were the same was an '05 Accord.