If you are going straight through a roundabout, even though you are going 1/2 way around the circle, there is no need to put your turn signal on. A car entering in the left or right lane and continuing in the same direction as when they entered, is going STRAIGHT. I see people putting on their turn signal which totally confuses me. e.g. If I am in the right lane and you are in the left lane at the same time, if you put your right turn signal on before we exit, I think that you are coming into MY lane. It is assumed that you are going straight through the roundabout unless you exit at the 1st exit from the right lane or the 3rd exit from the left lane.