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A lot of vehicles use a passive self adjusting system. As the pressure and velocity builds the holes in the grill create a blockage from interference drag. At highway speeds they only allow a fraction of the air through that they do with low speed.
Not sure if it is the best but think of a ford truck or car with a grill made from large wide flat plates with slots between them. The slots only allow much air at low speed.
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“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.
The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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