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(I know I'm little late jumping in here but I just had a thought)
Wouldn't it be more efficient to just stay behind the semi? I know it's more dangerous being behind one to some extent because it's harder to see the road ahead and depending on your distance, the driver of the truck can't see you. But those things aside, from a pure efficiency standpoint. It would seem like being behind the truck would yield more aero benefits then being in front and you wouldn't be holding traffic up anymore. If you are directly behind a semi, people are not going to assume that you are holding them up because they know that trucks go slow so they will just proceed around as normal. To top that you benefit from the hole he just punched in the road for you.
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