Both fog and mist are nothing but tiny water droplets that are released in air.
Or in other words, you can say that a cloud thick and heavy with water droplets that is released in air just above the or near the surface of the earth.
The only difference you might find in both of them is their density. Obviously, fog has more quantity of water in it so denser than the mist. In pilot’s term, when one cannot visualize farther than 1000meters, it is known as fog. Many of the motorists think that one should be able to see up to 200 meters before terming it as fog.
These droplets that are suspended in the air scatter the light rays that should have directly come to us; and so we cannot see the far away objects because of the blockage.
The objects we can see or visualize are fainter and blur because it is reduced in contrast because of the fog.
This contrast is varies every time and its changing depends on the distance of the object from you, the ratio of droplets and the scattering (smaller droplet swill increase the scattering and vice versa), it being fog or addition of smoke making it into smog and the color that is the wavelength of light ray that reaches your eye (red light scatters less than blue).
There are some things that you need to be sure out before stepping out in fog to drive.
Firstly, you should be able to strain your eyes and try to see as clearly as possible. Secondly, you should be able to show yourself to other that you are there. And thirdly, you should be able to show other what your next intention is going to be.
Preparations are also necessaries before starting your drive.
Check your windshields and mirrors should be clean and polished nicely.
Use a good lens cleaner solution and get your glasses clean in the inside and then on the outside.
See that your wipers do no leave marks or streak on the glass when used with windshield washer liquid.
Check whether the windshield washer fluid tank is full.
Your spectacles, the important thing, should not be tinted or polarized.
See that if you are wearing lenses they are sparkling clean.
If your car has the fog lamps, check if these work.
If they do not work install them as soon as possible.
It is a mandate that you keep a powerful torch with yourself.
Check the batteries of the torch.
You might need it to view the road at night if you can’t see it from a distance.
Driving in urban areas and then on highways makes a lot of difference. In urban areas, during the day time, you should be slow. There is absolutely no need to reach the maximum speed limit of the fog. Even in the day time, visibility is compromised to a larger scale. Even if you cannot see, make sure that you are seen by others. Always put your headlights on but on low beam but not on high beams otherwise it might cause unnecessary irritation. On a highway, be alert. Visibility range changes very fast on the highways. When on a clear patch, you might hit sudden pockets of fog. Do not panic. Sometimes, if it the worst condition stop and let the fog go. Do not stop on a curve.
When your intentions are known by others in the highway and if you are moving at a relatively slow pace, then definitely there is no need to worry. Always make sure that you are seen by the other people and never race when it is on the highway. This can cause unwanted incidents. Following these above preparations and points before starting your drive will make you confident enough to drive in fog stress free.