I have noticed a protruding ridge on the A pillars of some modern cars.
I think the approach is an attempt to channel air towards the roof rather than flowing over the A pillars towards the side windows. At least the high pressure zone over the windshield should be deeper this way allowing for a smoother airflow over the hood and windshield.
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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.
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