Before every roundabout there is a roadside sign that looks just like this. It shows two lanes entering the roundabout and what each lane is allowed to do. If you're in the right lane, you see half a circle with an arrow at the first exit and the second exit. If you're in the left lane you see a circle that goes 3/4 of the way around, and there is an arrow at the second exit and the third exit. Now memorized this sign.
