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After a fresh rain, I can clearly see the large vortex behind the cab on semis that are driving without their trailer.
I tried to get a video, but the contrast does not show up well.
Surely you all have seen this as well ( and the previously mentioned vortexes coming from wheelwells )
Once, I even was able to see a plastic bag that was caught in this vortex. It looks like a small tornado just behind the cab of the semi.
The airflow starts at the chassis just in front of the rear wheels and spirals upwards to the roof of the vehicle.
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