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Originally Posted by blue2000s
...although your use of the term laminar is a bit inaccurate...
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Well, yes and no. Laminar Flow of air does exist generally on several points on the top of a car. It is disrupted by such things as the windscreen and such, but often re-established on the rear deck.
As you know, laminar flow really gets the air moving and so it is at these points where the greatest low pressure areas exist.
Generally (and I'm being general because not all cars are the same), laminar flow is re-established on the rear panel of the car (trunk area behind the windscreen) and so it is an area of particular low pressure. This is where the spoiler comes into it's own, breaking up this clean laminar flow and restoring high pressure to that area. It also has the by-product of moving the very turbulent, drag producing air which accumulates right at the rear bumper further back, beyond the car's bodywork.
In essence, I really think we're saying the same thing, but from a different perspective.