Angled in like the yellow sign board photo may direct some air under the car.
If straight up and down, it should have an arc to direct flow to the sides.
If directed outward, some down-force maybe derived, which is a good thing, most of the time.
__________________
George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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