because fog is just a regular cloud lower to the ground, right? and if a cloud is just like air dust and water, how do a dozen cars going 80mph (130kph) not just blow it away??
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It does dispel the fog slightly from the movement and heat of the vehicles. I don’t have a scientific reference, but as you drive in fog, you can keep the vehicle in front in view for quite a distance because of the gap caused. Beyond that distance, the fog falls back in place and you are blinded. It’s a proven technique to keep the vehicle in front in view. However, they may be driving in blinding fog as the lead car so be ready to brake and maintain an “assured clear distance” ahead.
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