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draft
As the 2nd car approaches it's riding in the turbulence of the #1 car.It takes on all the base drag as it comes close and will have a negative pressure at its nose.This is why combustion air intakes are at the base of the windshield where there's a bit of static pressure and radiators must be sized to deal with the heat flux, as no ram air is present while in the draft until they slingshot.
The turbulence behind #1 car extends for hundreds of feet and you see #2 picking up a 'draft' at some distance behind.
#1 car itself does not see a benefit until #2 is quite close.
If #1 were a 'Template' car,#2 would see no 'draft' benefit,as there would be no wake to draft inside of.
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