Allow me to explain why at least one of them is so annoying. The roundabout is atop a hill; there is little visibility of what traffic is approaching from other directions because the hill is steep. Motorists don't bother signaling how far around they will go. I, riding a bicycle on a sidewalk, wish to go straight across the road. However I can't always see that someone is entering the circle. And even if I do see someone is entering, I don't know when they will exit. Compare this to an ordinary stop-signed intersection, where it is clear when vehicles are not turning and I can directly cross.