I use hand signal when I driving tractors on the road since they dont have signals. And I have decided that no one knows what they mean. I can't count how many times I have signaled left, and pointed were I'm turning only to have a car start passing me on the left. So far the tractor has not been hit, we did have a car go into a tree avoiding us last year. Also on a bike please take care when passing farm machinery, it is hard to see around, and is often longer and wider than you realize.
