SuzzeeeQ2012 wrote:
A question. A truck driver with experience...doesn't he KNOW by looking at the mirrors when to go back over?
:h
Yes, but your signal at least lets the driver know that you are now expecting the move back into the right lane. The signal gets even more helpful to the driver passing you in poor weather when the view in the outside mirrors becomes distorted due to heavy rain, etc.
Some truckers trying to pass are running at the top governed speed for their unit, and may be holding up traffic. If you are willing to have him return to your lane a little quicker than normal to help clear the traffic behind him, the signal works for this also.
Of course some drivers will ignore your signal anyway.
I rarely use the signal in daylight dry conditions, but will consistently signal at night and in rain.
Fred