I was trying to make "Michigan left" [en.wikipedia.org] -like intersection, and noticed that your U-turn road doesn't comply to line math. Specifically, 3 lanes go into 4 lanes + a U-turn lane. To preserve the number of lanes (which is usually done), it should be the other way around: 4 lanes incoming, of which three go straight and the innermost one is used for the U-turn. So, something like "From 2P 3P 4P 5P / To 3P 4P 5P", and 2P lane is used only for the U-turn. Please make the correct one! It would be very helpful, as CSUR is a natural choice if you want such intersections.