There was a previous thread on something similar and it was pointed out that only police or other designated law enforcement personnel are allowed to direct traffic, and by doing what the above driver did, he/she was directing traffic.
I have seen this on (OMG) 441/27 when a car is trying to enter from the right, but going to the center on left lane and someone in the right lane stop to let them out. The person coming out cannot see the traffic in the other lanes, very dangerous.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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