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The air will trip over it but still the air bubble ahead of the windscreen will be slightly bigger, creating a slightly more gentle flow (and slightly more upward).
To completely block that flow you'd need to make them protrude much further, but that might be a collision safety issue.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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