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As the car moves forward, that airflow then develops a corkscrew pattern, leading to the development of a trailing vortex.
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Tell me about it, I drive a VW Beetle. 
The action of a vortex is around a central axis longitudinal to the flow. Perhaps they only can act in pairs?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
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