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create controlled turbulance which achieves a thicker boundary layer that promotes clear seperation before the bend where the air would normally wrap around the vehicle creating major vortexes & negative pressure zones...
Yes also raises air pressure just at beginning of a low pressure zone so as to reduce compression of a following load face.
It is infacto a small spoiler in itself, like before windscreen if the rake is not correct.
Air transition around object with as little disruption as possible.
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