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Roundabout Service Interchange

For my next interchange, a simple service (road to highway) interchange, a roundabout service interchange.
You might be thinking, we already have a lot of this interchange in steam workshop, we don't need another one. So, I will give you some facts about this interchange to sell it

1. smooth slope (especially in the roundabout), you can plop it with slope limiter on
2. low height, ranging from -6 to 6 m
3. Each of the segment in the roundabout has the same length, making it more efficient. See the picture to be clear on what I mean
4. size :62 x 32