What you are hearing is the 'noise' of low pressure area in the cab. You happen to sit in it. With the air flowing in/out and about behind you, you've created an air pocket. Some of that air pocket will 'blend' into the front passengers, but that a function of wind flow, air temps, interior space configuration, etc. blah, blah, blah. Air is like water, it flows least resistance. This is the sort of thing design engineers need to hear. They design the outside panels to flow easily through the air (less wind resistance), they design for the ac/vent system, they rarely design for side wind.
Think NASCAR has designed for such with vehicle speeds exceeding 200 mph. Imagine if the driver couldn't communicate to the pit through the radio in his helmet.....
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