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Theoretically, two blunt objects sitting tandem in a flow will each see a decrease in drag. The rear object will see a much larger decrease, but the one in front will also see an improvement. It is most likely too negligable to see in real life (nor is it advisable).
Speaking from intuition, I doubt the corridor effect has any major effect on vehicle drag. I could only imagine it being useful in tunnels or maybe alongside massive soundwalls. Drafting on the other hand, while dangerous, is proven.
- LostCause
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