Fog lights. Most vehicles do not have them factory-installed, so you will have to have them installed yourself. They were not too expensive 20 years ago when I bought some. I don't know what the cost is now, however, if you have a small amount of mechanical ability you might install them yourself - I did.
Also, high beams do not help...in fact they illuminate the fog more and make it more difficult to see.
If you don't have fog lights just use your regular lights. If you can't see well enough to drive, pull over. If you can't pull over, concentrate a bit more of your attention on the paint markings on the pavement they usually can keep you in your lane, and even show you when to stop (as at an intersection).
Hazard Lights
use your low beams-head lights.
No...it lights up the fog making vision worse. Fog normally is least dense at the bottom and rarely reaches all the way to the ground. Thats why fog lights are way down low and why low beams are better than high beams when driving in fog.
low lights
Using low beam headlights and front facing fog lights.
go slower. leave your lights on. turn on your fog lights(if you have them) and do not turn on your bright lights!(in heavy fog) it will make it difficult to see for you and other drivers.
You should never use high beams when you are driving in fog because they shine up and ahead which will be reflected straight back into your eyes by the fog. Low beams (which aim downwards) and front fog lights (which are lower) are far better suited.
low beam
Low beams
Not using bright lights, turning off music/radio so you can hear traffic at intersections, opening windows at intersections, getting fog lights on the car, and using only low beans on the car.
Working fog lights are important to have a car for safe driving. The wiring diagram for the fog lights of a Toyota Avensis can be found in the maintenance manual.
When driving in fog it is best to drive with low your light on low beam. This will ensure that you get clear vision. You can use fog lights if you have them on your car and do not speed.