We use those signals during the light check when hitching up. Sweet Wife's daddy was a truck driver and she insists the signals be correct.
Here, we have the Atlanta Sneak Attack Stealth Lane Change Maneuver. It consists of turning on, for example, the left blinker, driving a quarter to half mile and suddenly swerve into the RIGHT lane. Then leave the blinker on for another 2 to 3 miles.
Usually see this in low end Range Rovers, BMWs and Mercedes.
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