The flaggers are only looking for aknowledgement when throwing a black flag at a specific person. When displaying a yellow they are focusing on the action on the track not people waving.
Waving in the car often indicates something to the car behind. "I see you, wait till the next passing zone." A wave out the window is a point by.
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1983 911 SC Targa - 1990 944 S2
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