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It definitely IS meant to make the air flow over the roof rather than curl around the side. It enlarges the bulge of slow moving air ahead of the car, which now has the hood/windscreen as the easiest escape route, just wat we want.
Many new cars have protruding A pillars, making it look like the windscreen is sunken back.
This has the same effect, and as a bonus the A pillar can be made thicker and stronger without impairing view from the inside.
On the white car the A pillars protrude inwards, funnily enough. Apparently the plow nose has doen its work and they can now be smooth on the outside.
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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 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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