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low pressure
The air going around the A-pillars and over the roof is traveling much faster than the ground speed of the car.
To satisfy Daniel Bournouli's ( sp?) Theorem,the pressure must be lower there.
The tufts are attempting to 'reach' the lower pressure regime and achieve equilibrium.
This is why you don't drive with a hatchback open,as the exhaust fumes also want to migrate through the cabin when the front windows are cracked.
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