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It might be instructive to take a drive on a windless day when it is lightly snowing and watch how the the snowflakes flow around and behind the car as it moves through them. It would make an interesting video and would visualize the airflows around the car. When I drive my car under these conditions, the snowflakes are smoothly lifted up in front of the car and then just as smoothly set back down behind it with no turbulence visible such as you see behind most cars. It is as if they are momentarily displaced as the car passes through and then continue quietly falling after the car has past as if the car had never been there. Completely unlike the mad swirl of snow you see trailing behind most cars and trucks.
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