When there is any traffic around I always use hand signals. If
I am going slow I use the left hand to signal right hand turns. If
I am going with any speed at all I will use my right hand to signal
right turns because I feel more stable starting the turn that way.
I am not sure why I use my left hand for the right turn signal
other than that was what I was taught when I was 5 or 6 and
first learned to ride a bike.