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If I understand the discussion, the question is about the vertical fences or wing fences on the hood and/or roof line, much similar function to strakes on underflow diffusers. On racecar/Bonneville Speed week cars the small wing fences contain 3D/circulating vortices, different flows and pressures from different areas on the vehicle's form and must retain all important steady tire grip & useful downforce. On the other handling performance spectrum, like WRC vehicles, where the vertical fences incorporated on their rear wings were so effective that they banned it. The rear wing fences again contain the large sideway lateral air from flowing through the chord of the wing & the fences keep the downforce steady than losing its grip especially on wild turning drifts. Standard road vehicles face strong side winds and sudden turbulences from large transport vehicles and such fences could be detrimental and upset handling safety.
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