I wouldn't think a Ford F150 would be considered a "little car". Actually, the air would be entering through the raised back of a hood. The base of the windshield is a point of high pressure with most cars (which is why they place the air vent intakes there). So raising the back of the hood allows additional air to enter to join the air entering through the grill inlets and eventually exiting out the bottom of the engine compartment to add to the air turbulence underneath most cars.
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